PYTHON-1269 Update list of CQL keywords

* Add MBEAN and MBEANS to reserved words (CASSANDRA-15663)
* Move UNSET outside of DSE specific (CASSANDRA-15663)

Author: Gerrrr

CHANGELOG.rst

@@ -11,6 +11,7 @@ Features
 Bug Fixes
 ---------
 * Asyncore race condition cause logging exception on shutdown (PYTHON-1266)
+* Update list of reserved keywords (PYTHON-1269)
 
 Others
 ------

cassandra/metadata.py

@@ -52,18 +52,18 @@
     'counter', 'create', 'custom', 'date', 'decimal', 'default', 'delete', 'desc', 'describe', 'deterministic', 'distinct', 'double', 'drop',
     'entries', 'execute', 'exists', 'filtering', 'finalfunc', 'float', 'from', 'frozen', 'full', 'function',
     'functions', 'grant', 'if', 'in', 'index', 'inet', 'infinity', 'initcond', 'input', 'insert', 'int', 'into', 'is', 'json',
-    'key', 'keys', 'keyspace', 'keyspaces', 'language', 'limit', 'list', 'login', 'map', 'materialized', 'modify', 'monotonic', 'nan', 'nologin',
-    'norecursive', 'nosuperuser', 'not', 'null', 'of', 'on', 'options', 'or', 'order', 'password', 'permission',
+    'key', 'keys', 'keyspace', 'keyspaces', 'language', 'limit', 'list', 'login', 'map', 'materialized', 'mbean', 'mbeans', 'modify', 'monotonic',
+    'nan', 'nologin', 'norecursive', 'nosuperuser', 'not', 'null', 'of', 'on', 'options', 'or', 'order', 'password', 'permission',
     'permissions', 'primary', 'rename', 'replace', 'returns', 'revoke', 'role', 'roles', 'schema', 'select', 'set',
     'sfunc', 'smallint', 'static', 'storage', 'stype', 'superuser', 'table', 'text', 'time', 'timestamp', 'timeuuid',
-    'tinyint', 'to', 'token', 'trigger', 'truncate', 'ttl', 'tuple', 'type', 'unlogged', 'update', 'use', 'user',
+    'tinyint', 'to', 'token', 'trigger', 'truncate', 'ttl', 'tuple', 'type', 'unlogged', 'unset', 'update', 'use', 'user',
     'users', 'using', 'uuid', 'values', 'varchar', 'varint', 'view', 'where', 'with', 'writetime',
 
     # DSE specifics
     "node", "nodes", "plan", "active", "application", "applications", "java", "executor", "executors", "std_out", "std_err",
     "renew", "delegation", "no", "redact", "token", "lowercasestring", "cluster", "authentication", "schemes", "scheme",
     "internal", "ldap", "kerberos", "remote", "object", "method", "call", "calls", "search", "schema", "config", "rows",
-    "columns", "profiles", "commit", "reload", "unset", "rebuild", "field", "workpool", "any", "submission", "indices",
+    "columns", "profiles", "commit", "reload", "rebuild", "field", "workpool", "any", "submission", "indices",
     "restrict", "unrestrict"
 ))
 """