Update git bare repository with a graceful way

Update git bare repository with a graceful way

Generally, `git fetch --all` will not synchronize local branches to
remote ones util maps local branches of the source to local branches of the
target. `git fetch --all` combined with `git clone --mirror`will end
this.

Change-Id: Ie799cfbf67a847b1ded54a6390844f9acd3ae342
Reviewed-on: https://otctools.jf.intel.com/review/6422
Tested-by: OTC Tools Tester <ed.bartosh@linux.intel.com>
Reviewed-by: Eduard Bartosh <eduard.bartosh@intel.com>