Always convert string type params to string

Schema.to_schema_type() should convert values passed to it to the
appropriate type.  So if the user passed a version number of 9.4 and
they defined it in the template with a string type, we should get the
string '9.4' back, instead of the error "The value '9.4' is invalid for
type 'string'".

Co-Authored-By: Richard Lee <rblee88@gmail.com>
Closes-Bug: #1353701
Change-Id: If7abd129dc7819c6ac01f9bf7dfdbe397ec09c65
Add config file for performance gate job

This job is called gate-rally-dsvm-fakevirt-heat.
Also added readme and plugin sample.

Change-Id: Ic4f482e566f3552b3fdf7129b8447e7def036441
Merge "Always convert string type params to string"
Merge "Add config file for performance gate job"