Remove hive_port

When using TheHive in a configuration that is not top-level (`https://IP/thehive/`), the current code does not work, as it concatenates `hive_host` & `hive_port` which creates `https://IP/thehive/:443`

This tweak removes the need to explicitly specify a port and instead specify only `hive_host`.  A couple examples: 
`hive_host: https://192.168.15.23:8080`
`hive_host: https://192.168.15.23/thehive/`
`hive_host: https://192.168.15.23:8080/thehive/`

This tweak should be considered a breaking change, as current users will need to update their `hive_connection` configuration if `hive_url` does not contain the required port.

Author: defensivedepth

elastalert/alerts.py

@@ -2111,7 +2111,7 @@ def alert(self, matches):
         connection_details = self.rule['hive_connection']
 
         api = TheHiveApi(
-            '{hive_host}:{hive_port}'.format(**connection_details),
+            connection_details.get('hive_host'),
             connection_details.get('hive_apikey', ''),
             proxies=connection_details.get('hive_proxies', {'http': '', 'https': ''}),
             cert=connection_details.get('hive_verify', False))