Fixed gate-trove-functional-dsvm jobs

Fixed the post_test_hook for the gate-trove-functional-dsvm job
template to set up the environment correctly to run and run Trove
functional tests using the test scripts from the trove-integration
project.

Change-Id: Ic470268858e03970c2628ef06e1ed21940ed27f9
Depends-On: I78471d7f11d0f1a23e2efc28da2e62c5707e575a
Merge "Fixed gate-trove-functional-dsvm jobs"