Fix filter_commit in common_translation_update.sh
Fix filter_commit in common_translation_update.sh

This fixes a problem with propose_translation_update.sh on
oslo.concurrency:

+ git reset -q oslo.concurrency/locale/en_GB/LC_MESSAGES/oslo.concurrency-log-error.po
fatal: ambiguous argument
'oslo.concurrency/locale/en_GB/LC_MESSAGES/oslo.concurrency-log-error.po': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

Add the "--" to separate paths to handle deleted files as well.

Change-Id: Ifbce50bd851ea0028ebbb948e5173bda5777fc43

Tesora/tesora-project-config,Tesora/tesora-project-config,noorul/os-project-config,noorul/os-project-config,anbangr/osci-project-config,coolsvap/project-config,openstack-infra/project-config,openstack-infra/project-config,dongwenjuan/project-config,coolsvap/project-config,anbangr/osci-project-config,dongwenjuan/project-config