fix: bring back snmp-port (#46)

Added the ability to transmit the user defined port to easysnmp. Which gives you the ability to define it as a new argument/field in icinga director.

check_synology.py

@@ -51,6 +51,7 @@ def croak(message=None):
 try:
     session = easysnmp.Session(
         hostname=hostname,
+        remote_port=port,
         version=3,
         timeout=snmp_timeout,
         retries=snmp_retries,