Add a -t <test-branch-prefix> argument to git-merge-forward.sh and
git-push-all.sh, which makes these scripts create, merge forward, and
push test branches.
Add a -r <remote-name> argument to git-push-all.sh, so the script can
push test branches to a personal remote.
Closes ticket 31314.
(I've chosen to suppress some instances rather than 'fix' them,
since the fix would require arrays or major refactoring.)
Fixes bug 31519; bug not in any released Tor.
Add a TOR_PUSH_DELAY variable to git-push-all.sh, which makes the script
push master and maint branches with a delay between each branch. These
delays trigger the CI jobs in a set order, which should show the most
likely failures first.
Also:
* make pushes atomic by default, and
* make the script pass any command-line arguments to git push.
Closes ticket 29879.
