API Calls From Workflows And Scripts Support

Need to add an API call support to Murano workflows.

Idea is to use Trove to provision MySQL. Then use another service, like Sahara, to provision Hadoop.
Then combine these servers together - MySQL could be used as a data-source for Hadoop MapReduce jobs.

Another example:
Murano will use Trove to provision MySQL cluster
Murano will use "Tomcat-As-A-Service" to provision Tomcat in HA mode
Murano will allow to combine MySQL and Tomcat. Tomcat will use MySQL as database.

All these actions can be performed from Murano dashboard - select services, combine them with each other.

We need to add an API call support to Murano workflows. We need to be able to do API calls to Trove and Sahara to create configurations via them.