PEP 8 fixes.

test/sanity/pep8/legacy-files.txt

@@ -66,7 +66,6 @@ lib/ansible/module_utils/gcdns.py
 lib/ansible/module_utils/gce.py
 lib/ansible/module_utils/gcp.py
 lib/ansible/module_utils/infinibox.py
-lib/ansible/module_utils/iosxr.py
 lib/ansible/module_utils/json_utils.py
 lib/ansible/module_utils/junos.py
 lib/ansible/module_utils/known_hosts.py
@@ -840,7 +839,6 @@ lib/ansible/plugins/strategy/free.py
 lib/ansible/plugins/strategy/linear.py
 lib/ansible/plugins/terminal/asa.py
 lib/ansible/plugins/terminal/eos.py
-lib/ansible/plugins/terminal/iosxr.py
 lib/ansible/plugins/terminal/junos.py
 lib/ansible/plugins/terminal/nxos.py
 lib/ansible/plugins/test/core.py