Fix to use . to source script files
Fix to use . to source script files

Adhering to coding conventions. Refer to ``Code conventions`` at
https://docs.openstack.org/contributor-guide/ for details.
When you have to source a script file, for example, a credentials file
to gain access to user-only or admin-only CLI commands, use . instead of source.
https://docs.openstack.org/contributor-guide/writing-style/code-conventions.html

Change-Id: I97c0cc8b9215b0f580311b1850b13a72f9ced60a

openstack/mistral,StackStorm/mistral,openstack/mistral,StackStorm/mistral