int tests: stop special casing KUBE_TEST_ARGS

Stop special casing KUBE_TEST_ARGS and limiting the API
group/version settings to "v1" when running the tests. This was
helpful in the past when we used to test multiple values for
KUBE_TEST_API_VERSIONS - if you were specifying KUBE_TEST_ARGS to run a
single test case, you probably didn't want to have it tested for
multiple values of KUBE_TEST_API_VERSIONS.

Now, however, KUBE_TEST_API_VERSIONS comes from
KUBE_AVAILABLE_GROUP_VERSIONS by default, which is a single list instead
of multiple, so we shouldn't need to special case KUBE_TEST_ARGS any
more. This is especially necessary because certain tests that are using
testapi break if KUBE_TEST_API_VERSIONS is just "v1".

Signed-off-by: Andy Goldstein <goldsteina@vmware.com>

hack/make-rules/test-integration.sh

@@ -93,12 +93,6 @@ checkEtcdOnPath
 # Run cleanup to stop etcd on interrupt or other kill signal.
 trap cleanup EXIT
 
-# If a test case is specified, just run once with v1 API version and exit
-if [[ -n "${KUBE_TEST_ARGS}" ]]; then
-  runTests v1
-  exit 0
-fi
-
 # Convert the CSV to an array of API versions to test
 IFS=';' read -a apiVersions <<< "${KUBE_TEST_API_VERSIONS}"
 for apiVersion in "${apiVersions[@]}"; do