Simple optimization of creating/updating workflows
Simple optimization of creating/updating workflows

In case we load definition of one workflow, there is no need to convert
it to yaml and back.

Change-Id: Ia7fb914843e56650c8f6ff5e8c16d1b57001c0fc
Signed-off-by: Oleg Ovcharuk <2cbacb579a57185327e5bceb6229c02a34a4c052@gmail.com>

openstack/mistral,openstack/mistral