tools/lib/git: Set verbose to false for the last git pull command in git.Pull function.
tools/lib/git: Set verbose to false for the last git pull command in git.Pull function.

Change-Id: I61331404fadf914f87726c9ea37882eca3f8ed3f

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