run-tests: use regex when searching for $HGPORT in test output
This prevents spurious errors when a changeset hash happens to match
the port number. Before, this invocation gave a test failure:
$ ./run-tests.py test-log.t --port 24427
ERROR: /home/mg/src/mercurial-crew/tests/test-log.t output changed
--- /home/mg/src/mercurial-crew/tests/test-log.t
+++ /home/mg/src/mercurial-crew/tests/test-log.t.err
@@ -626,12 +626,12 @@
$ hg log -b default
changeset: 2:c3a4f03cc9a7
- parent: 0:24427303d56f
+ parent: 0:$HGPORT303d56f
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit on default
...
$ hg init
$ cat > a <<EOF
> a
> b
> c
> EOF
$ hg ci -Am adda
adding a
$ cat > a <<EOF
> d
> e
> f
> EOF
$ hg ci -m moda
$ hg diff --reverse -r0 -r1
diff -r 2855cdcfcbb7 -r 8e1805a3cf6e a
--- a/a Thu Jan 01 00:00:00 1970 +0000
+++ b/a Thu Jan 01 00:00:00 1970 +0000
@@ -1,3 +1,3 @@
-d
-e
-f
+a
+b
+c
$ cat >> a <<EOF
> g
> h
> EOF
$ hg diff --reverse --nodates
diff -r 2855cdcfcbb7 a
--- a/a
+++ b/a
@@ -1,5 +1,3 @@
d
e
f
-g
-h