Fix two issues with shell/config scripts for hosted repositories

Summary: Ref T4151. `-ne` is numeric in some/most/all shells; `exec --` apparently doens't always work.

Test Plan: Will make @zeeg test.

Reviewers: btrahan, zeeg

Reviewed By: zeeg

CC: zeeg, aran

Maniphest Tasks: T4151

Differential Revision: https://secure.phabricator.com/D7702

resources/sshd/phabricator-ssh-hook.sh

@@ -6,7 +6,7 @@ VCSUSER="vcs-user"
 # NOTE: Replace this with the path to your Phabricator directory.
 ROOT="/path/to/phabricator"
 
-if [ "$1" -ne "$VCSUSER" ];
+if [ "$1" != "$VCSUSER" ];
 then
   exit 1
 fi

src/applications/repository/engine/PhabricatorRepositoryPullEngine.php

@@ -162,7 +162,7 @@ final class PhabricatorRepositoryPullEngine
 
     $root = dirname(phutil_get_library_root('phabricator'));
     $bin = $root.'/bin/commit-hook';
-    $cmd = csprintf('exec -- %s %s "$@"', $bin, $callsign);
+    $cmd = csprintf('exec %s %s "$@"', $bin, $callsign);
 
     $hook = "#!/bin/sh\n{$cmd}\n";