doc change: remove duplicate general job parameters

This change adds a test to validate the general job parameters and uses
that test as documentation for the general module.   It also replaces the
doc of the general params in the top level definitions.rst with references
to the general module.

Change-Id: I3df04d69186ca49d7297f8141855a4c72c73be1e
Merge "doc change: remove duplicate general job parameters"