Cloner: correct fetch on pre-1.9 git

Commit 6c54b531a36644d53ae054d3fdf846fb2e538677 changed the cloner
to use 'fetch --tags' instead of update, however, 'fetch --tags'
does not actually update heads before git version 1.9.  So if we
are using old versions of git, run both commands so that we get
persistent behavior.

Change-Id: I8ea8ac2c6a8384845a3310da63974afc3279564f
1 file changed