Fixes to script functionality.
Fixes to script functionality.

1. Passing path to load_current_versions call.
2. Double quotes around new FW id value.
3. Number of iterations are now a cmd line flag.

BUG=None
TEST=manual run

Change-Id: Id49596c373b988ddcb2e65dd7cd6230428d06ca6
Reviewed-on: https://gerrit.chromium.org/gerrit/36383
Tested-by: Yusuf Mohsinally <56be0319ebba0e9fab2296e59e3f7f23a800a2a0@google.com>
Reviewed-by: Kris Rambish <8a1e16570749310c5add42ae1efec654b4ce43a0@chromium.org>
Commit-Ready: Yusuf Mohsinally <56be0319ebba0e9fab2296e59e3f7f23a800a2a0@google.com>

mgireesh05/dev-util,coreos/dev-util,coreos/dev-util,marineam/coreos-dev-util,mgireesh05/dev-util,marineam/coreos-dev-util,mgireesh05/dev-util,coreos/dev-util