Remove hive_port
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.
Yelp/elastalert