forcePull has been renamed to force-pull, the default value is false and it is…

forcePull has been renamed to force-pull, the default value is false and it is deprecated. Remove it from the test script.

test/run

@@ -15,7 +15,7 @@ cid_file=$(mktemp -u --suffix=.cid)
 
 # Since we built the candidate image locally, we don't want STI attempt to pull
 # it from Docker hub
-sti_args="--forcePull=false -s ${scripts_url}"
+sti_args="-s ${scripts_url}"
 
 # TODO: This should be part of the image metadata
 test_port=8080