test-push-http: use killdaemons.py instead of kill to avoid test unreliability

tests/test-push-http.t

@@ -1,87 +1,87 b''
 
   $ hg init test
   $ cd test
   $ echo a > a
   $ hg ci -Ama
   adding a
   $ cd ..
   $ hg clone test test2
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd test2
   $ echo a >> a
   $ hg ci -mb
   $ req() {
   >     hg serve -p $HGPORT -d --pid-file=hg.pid -E errors.log
   >     cat hg.pid >> $DAEMON_PIDS
   >     hg --cwd ../test2 push http://localhost:$HGPORT/
-  >     kill `cat hg.pid`
+  >     "$TESTDIR/killdaemons.py"
   >     echo % serve errors
   >     cat errors.log
   > }
   $ cd ../test
 
 expect ssl error
 
   $ req
   pushing to http://localhost:$HGPORT/
   searching for changes
   remote: ssl required
   % serve errors
 
 expect authorization error
 
   $ echo '[web]' > .hg/hgrc
   $ echo 'push_ssl = false' >> .hg/hgrc
   $ req
   pushing to http://localhost:$HGPORT/
   searching for changes
   abort: authorization failed
   % serve errors
 
 expect authorization error: must have authorized user
 
   $ echo 'allow_push = unperson' >> .hg/hgrc
   $ req
   pushing to http://localhost:$HGPORT/
   searching for changes
   abort: authorization failed
   % serve errors
 
 expect success
 
   $ echo 'allow_push = *' >> .hg/hgrc
   $ echo '[hooks]' >> .hg/hgrc
   $ echo 'changegroup = python "$TESTDIR"/printenv.py changegroup 0' >> .hg/hgrc
   $ req
   pushing to http://localhost:$HGPORT/
   searching for changes
   remote: adding changesets
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
   remote: changegroup hook: HG_NODE=ba677d0156c1196c1a699fa53f390dcfc3ce3872 HG_SOURCE=serve HG_URL=remote:http:*:  (glob)
   % serve errors
   $ hg rollback
   repository tip rolled back to revision 0 (undo serve)
   working directory now based on revision 0
 
 expect authorization error: all users denied
 
   $ echo '[web]' > .hg/hgrc
   $ echo 'push_ssl = false' >> .hg/hgrc
   $ echo 'deny_push = *' >> .hg/hgrc
   $ req
   pushing to http://localhost:$HGPORT/
   searching for changes
   abort: authorization failed
   % serve errors
 
 expect authorization error: some users denied, users must be authenticated
 
   $ echo 'deny_push = unperson' >> .hg/hgrc
   $ req
   pushing to http://localhost:$HGPORT/
   searching for changes
   abort: authorization failed
   % serve errors