tests: merge 'test-push-hook-lock.t' into 'test-push.t'

That test file is very small and is merge with the new 'test-push.t'. No logic
is changed.

We don't register this as a copy because is actually a "ypoc" merging two file
together without replacing the destination and Mercurial cannot express that.

tests/test-push.t

@@ -243,3 +243,57 b' Expected to fail:'
   [255]
 
   $ cd ..
+
+Test push hook locking
+=====================
+
+  $ hg init 1
+
+  $ echo '[ui]' >> 1/.hg/hgrc
+  $ echo 'timeout = 10' >> 1/.hg/hgrc
+
+  $ echo foo > 1/foo
+  $ hg --cwd 1 ci -A -m foo
+  adding foo
+
+  $ hg clone 1 2
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+  $ hg clone 2 3
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+  $ cat <<EOF > $TESTTMP/debuglocks-pretxn-hook.sh
+  > hg debuglocks
+  > true
+  > EOF
+  $ echo '[hooks]' >> 2/.hg/hgrc
+  $ echo "pretxnchangegroup.a = sh $TESTTMP/debuglocks-pretxn-hook.sh" >> 2/.hg/hgrc
+  $ echo 'changegroup.push = hg push -qf ../1' >> 2/.hg/hgrc
+
+  $ echo bar >> 3/foo
+  $ hg --cwd 3 ci -m bar
+
+  $ hg --cwd 3 push ../2 --config devel.legacy.exchange=bundle1
+  pushing to ../2
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  lock:  user *, process * (*s) (glob)
+  wlock: free
+
+  $ hg --cwd 1 --config extensions.strip= strip tip -q
+  $ hg --cwd 2 --config extensions.strip= strip tip -q
+  $ hg --cwd 3 push ../2 # bundle2+
+  pushing to ../2
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  lock:  user *, process * (*s) (glob)
+  wlock: user *, process * (*s) (glob)
+