Parse arguments in add_client_render_server_tests()

This fixes a bug in which the arguments for pvcrs tests were
not being parsed causing tests with plugins to fail.

Change-Id: If5c77c96f24f6a6f7cf72da9dbb6b805422b2b61
Merge topic 'add-test-plugin-option-v2' into next

6035cd7 Parse arguments in add_client_render_server_tests()