Fix TLS tests by enforcing tlsmode=require and defining CA_cert

Author: sharmagot

vertica_python/tests/integration_tests/test_tls.py

@@ -328,6 +328,7 @@ def test_tls13_support_auto_negotiation(self):
         ssl_context.load_verify_locations(cadata=CA_cert)
 
         self._conn_info['ssl'] = ssl_context
+        self._conn_info['tlsmode'] = 'require'
 
         with self._connect() as conn:
             # First ensure TLS really got enabled on server
@@ -360,7 +361,6 @@ def test_sslcontext_mutual_TLS(self):
         ssl_context.load_cert_chain(certfile=self.client_cert.name, keyfile=self.client_key.name)
 
         self._conn_info['ssl'] = ssl_context
-        self._conn_info['tlsmode'] = 'require'
         with self._connect() as conn:
             cur = conn.cursor()
             res = self._query_and_fetchone(self.SSL_STATE_SQL)