tests: remove pid file by default

tests: remove pid file by default

Previously, killdaemons.py would kill PIDs listed in a file then
leave the file lingering around.

If the PIDs are killed, then there's no point leaving the PID file
around. In the worst case, a later invocation of killdaemons.py
(run-tests.py invokes killdaemons.py after running a test) could kill
a separate process whose PID conflicted with a previously-killed
process. By removing the PID file, we eliminate this possibility.

Some tests were manually removing the PID file after calling
killdaemons.py. So we update these tests to not do this.

Differential Revision: https://phab.mercurial-scm.org/D3443

--- a/tests/killdaemons.py	Mon Apr 30 19:54:55 2018 -0700
+++ b/tests/killdaemons.py	Sat May 05 19:00:03 2018 -0700
@@ -124,4 +124,4 @@
     else:
         path = os.environ["DAEMON_PIDS"]
 
-    killdaemons(path)
+    killdaemons(path, remove=True)

--- a/tests/test-lfs-test-server.t	Mon Apr 30 19:54:55 2018 -0700
+++ b/tests/test-lfs-test-server.t	Sat May 05 19:00:03 2018 -0700
@@ -880,7 +880,6 @@
   $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
 #endif
 
-  $ rm $DAEMON_PIDS
   $ mkdir $TESTTMP/lfs-server2
   $ cd $TESTTMP/lfs-server2
 #if no-windows git-server

--- a/tests/test-obsolete.t	Mon Apr 30 19:54:55 2018 -0700
+++ b/tests/test-obsolete.t	Sat May 05 19:00:03 2018 -0700
@@ -931,7 +931,7 @@
   $ echo "evolution.exchange=True" >> $HGRCPATH
   $ echo "evolution.createmarkers=True" >> $HGRCPATH
 
-  $ rm hg.pid access.log errors.log
+  $ rm access.log errors.log
 #endif
 
 Several troubles on the same changeset (create an unstable and bumped changeset)

--- a/tests/test-run-tests.t	Mon Apr 30 19:54:55 2018 -0700
+++ b/tests/test-run-tests.t	Sat May 05 19:00:03 2018 -0700
@@ -574,7 +574,6 @@
   # Ran 1 tests, 0 skipped, 0 failed.
   $ rm test-serve-inuse.t
   $ killdaemons.py $DAEMON_PIDS
-  $ rm $DAEMON_PIDS
 
 Running In Debug Mode
 ======================

--- a/tests/test-serve.t	Mon Apr 30 19:54:55 2018 -0700
+++ b/tests/test-serve.t	Sat May 05 19:00:03 2018 -0700
@@ -6,10 +6,11 @@
   >        | sed -e "s/:$HGPORT1\\([^0-9]\\)/:HGPORT1\1/g" \
   >              -e "s/:$HGPORT2\\([^0-9]\\)/:HGPORT2\1/g" \
   >              -e 's/http:\/\/[^/]*\//http:\/\/localhost\//'
-  >    cat hg.pid >> "$DAEMON_PIDS"
+  >    if [ -f hg.pid ]; then
+  >        killdaemons.py hg.pid
+  >    fi
   >    echo % errors
   >    cat errors.log
-  >    killdaemons.py hg.pid
   > }
 
   $ hg init test