tools/git-veyron: Fix some bugs in "git veyron status"
tools/git-veyron: Fix some bugs in "git veyron status"

- If the current repo's branch is master, all repos with current branch as
  master would be printed, regardless of --show_master.
- Add a separator between the current repo's branch and all others.
- Don't print the current repo name since most people have it in
  the directory part of the bash prompt.

Change-Id: I372b3bfbc44cc3caf1e08406bdd0477d0b2542dc

vanadium/go.devtools,vanadium/go.devtools,vanadium/go.devtools