update function name bc ddr-cmdln name change

see ddr-cmdln 70b1dcdf08.
keep all gitstatus files in STORE/tmp

Keep everything in a single directory at root of STORE instead
of spraying them around the repo dirs.
- STORE/tmp/gitstatus-queue
- STORE/tmp/REPO-ORG-CID.status
gitstatus named locks

Each task that needs to create a lock adds its keyword to the
gitstatus lockfile.  This helps avoid race conditions that might
result in the lockfile being removed while task is still running.
rm call to collection.repo_fetch, git-status now cached