Fix header issue for baremetal_deploy_helper.py

Fix header issue

baremetal_deploy_helper.py is not a python script which can not
be run directly, so there is no need to keep "#!/usr/bin/env python"
but change it to "# vim: tabstop=4 shiftwidth=4 softtabstop=4"

Change-Id: Ic4957673605cd71dc19fc38a2626bdaa35d102c0
Merge "Fix header issue for baremetal_deploy_helper.py"