debuglock: make the command more useful in non-interactive mode
The existing prompt mode simply release the lock immediately in non-interactive
mode. That is quite useless in the test so now the non-interactive mode simply
wait for a signal.
Differential Revision: https://phab.mercurial-scm.org/D12616
auto-upgrade: add a test case with no permission to lock the repository
This show the current behavior when the repository is unlockable.
The current behavior is to abort, which is probably not great. Now that we have
a proper test, we can think about the behavior we want in a later changeset.
Differential Revision: https://phab.mercurial-scm.org/D12615