test: stabilize test-run-tests.t output

test: stabilize test-run-tests.t output

We have reached a point where the duration in JSON reports of
`test-run-tests.t` were greater or equal than 10 seconds, which doesn't match
anymore the regex. For example here:
https://ci.octobus.net/blue/organizations/jenkins/MercurialPy2/detail/MercurialPy2/276/pipeline

```
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "10.040",
           "result": "skip", ? (re)
```

Instead of accepting more characters, I changed the regex to accept any number
of digits before the `.` then 3 or 4 digits after. This way the regex is more
precise (only one `.` is authorized and we can ensure that the precision
doesn't change).

Differential Revision: https://phab.mercurial-scm.org/D5966

--- a/tests/test-run-tests.t	Thu Feb 14 14:36:16 2019 +0100
+++ b/tests/test-run-tests.t	Thu Feb 14 15:35:47 2019 +0100
@@ -1174,31 +1174,31 @@
   $ cat report.json
   testreport ={
       "test-failure.t": [\{] (re)
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "---.+\+\+\+.+", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "failure", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }, ? (re)
       "test-skip.t": {
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "skip", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }, ? (re)
       "test-success.t": [\{] (re)
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "success", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }
   } (no-eol)
 --json with --outputdir
@@ -1231,31 +1231,31 @@
   $ cat output/report.json
   testreport ={
       "test-failure.t": [\{] (re)
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "---.+\+\+\+.+", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "failure", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }, ? (re)
       "test-skip.t": {
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "skip", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }, ? (re)
       "test-success.t": [\{] (re)
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "success", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }
   } (no-eol)
   $ ls -a output
@@ -1287,31 +1287,31 @@
   $ cat report.json
   testreport ={
       "test-failure.t": [\{] (re)
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "success", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }, ? (re)
       "test-skip.t": {
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "skip", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }, ? (re)
       "test-success.t": [\{] (re)
-          "csys": "\s*[\d\.]{4,5}", ? (re)
-          "cuser": "\s*[\d\.]{4,5}", ? (re)
+          "csys": "\s*\d+\.\d{3,4}", ? (re)
+          "cuser": "\s*\d+\.\d{3,4}", ? (re)
           "diff": "", ? (re)
-          "end": "\s*[\d\.]{4,5}", ? (re)
+          "end": "\s*\d+\.\d{3,4}", ? (re)
           "result": "success", ? (re)
-          "start": "\s*[\d\.]{4,5}", ? (re)
-          "time": "\s*[\d\.]{4,5}" (re)
+          "start": "\s*\d+\.\d{3,4}", ? (re)
+          "time": "\s*\d+\.\d{3,4}" (re)
       }
   } (no-eol)
   $ mv backup test-failure.t