Added new OS releases to the const.py file to match Nova version

Related-PROD: PROD-37028
Change-Id: Ia51e408901469db29dd81b0441c676cd62c7267e
diff --git a/cfg_checker/common/const.py b/cfg_checker/common/const.py
index 25b264e..f2b3d3f 100644
--- a/cfg_checker/common/const.py
+++ b/cfg_checker/common/const.py
@@ -147,6 +147,8 @@
 }
 
 nova_openstack_versions = {
+    "28": "Bobcat",
+    "27": "Antelope",
     "26": "Zed",
     "25": "Yoga",
     "24": "Xena",