Make PostCheckout hooks not quiet by default

This keeps users more informed of what's happening when their HEAD
changes.

Change-Id: I76f89524bd86453dea5ca4d5575ecac1236d2e92
Reviewed-on: http://gerrit.causes.com/35639
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>