Extract configs beginning with "edp." from job_configs['configs']

Allow configuration parameters beginning with "edp." to be extracted
from the job configuration during workflow generation. This provides
a consistent, extensible method for passing job-type specific settings
to Savanna which impact the workflow (but which do not appear in the
<configuration/> section of the workflow).

Implements: blueprint edp-config-parameter-prefix

Change-Id: I9641f8f84a4807646940e43e92370faae3460609
Merge "Extract configs beginning with "edp." from job_configs['configs']"