Avoid needlessly running 2 argspecs in salt.utils.format_call()
Avoid needlessly running 2 argspecs in salt.utils.format_call()

Both format_call() and arg_lookup() perform an argspec, and
format_call() invokes arg_lookup(). This commit allows for an argpsec to
be passed into arg_lookup(), avoiding the need to perform the argspec a
second time.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt