[stable-2.8] Pin openshift <=0.9.0 to prevent test failures (#60245)

(cherry picked from commit 9cb4783)

Co-authored-by: Sam Doran <sdoran@redhat.com>

test/runner/requirements/constraints.txt

@@ -23,7 +23,7 @@ requests < 2.20.0 ; python_version < '2.7' # requests 2.20.0 drops support for p
 requests-ntlm >= 1.1.0 # message encryption support
 requests-credssp >= 0.1.0 # message encryption support
 voluptuous >= 0.11.0 # Schema recursion via Self
-openshift >= 0.6.2 # merge_type support
+openshift >= 0.6.2, < 0.9.0 # merge_type support
 virtualenv < 16.0.0 ; python_version < '2.7' # virtualenv 16.0.0 and later require python 2.7 or later
 pyopenssl < 18.0.0 ; python_version < '2.7' # pyOpenSSL 18.0.0 and later require python 2.7 or later
 pyfmg == 0.6.1 # newer versions do not pass current unit tests