labs: fix wbatch_reset calls
labs: fix wbatch_reset calls

Don't call wbatch_reset (to clean the wbatch directory) if -n (dry-run)
option is provided, but do call wbatch_reset even when not in fast mode
(-f).

Change-Id: I4965061bf1e5f222403ee8e586beefa298ec3eec

openstack/training-labs,dguitarbite/OpenStack-Labs,dguitarbite/OpenStack-Labs,openstack/training-labs,openstack/training-labs,dguitarbite/OpenStack-Labs