Added to 'only' marker to pytest.ini

Author: Andyg79

pytest.ini

@@ -27,6 +27,7 @@ markers =
     utils: test setup and support methods
     smoke: tests designed to run as part of the smokescreen regression test suite
     wip: tests that are currently in progress
+    only: when you want to mark a single test to run
     smokescreen: all compartments to be run as part of the smokescreen
     compartment1: only for compartment 1
     compartment2: only for compartment 2