Only fetch first commit of target branch
Filter out current branch

When on a branch other than master, the '*' marker stayed in the
list and caused weird results due to it being expanded by bash.

Stripping the first two characters (spaces, or "* ") fixes this.
Merge branch 'git-br-current' of https://github.com/Krinkle/gerrit-sweep into Krinkle-git-br-current

Conflicts:
	gerrit-sweep
Merge branch 'Krinkle-git-br-current'