cli: Convert port params to int

Otherwise strings are passed and it can't start up.
Sockets can't be created when a string is passed as the port param

#4 - Investigate extending pr0xy to use SAM

contained/bin/trans_proxy/cli.py

@@ -46,17 +46,20 @@ def main():
     parser.add_argument(
         "-p", "--port",
         default=1234,
+        type=int,
         help="Where all traffic should enter to be forwarded")
     parser.add_argument(
         "--sam-host",
         default=os.environ.get(ENV_SAM_HOST, sam.DEFAULT_ADDRESS[0]))
     parser.add_argument(
         "--sam-port",
+        type=int,
         default=os.environ.get(ENV_SAM_PORT, sam.DEFAULT_ADDRESS[1]))
 
     dns_group = parser.add_argument_group('dns')
     dns_group.add_argument(
         "--dns-port",
+        type=int,
         default=os.environ.get(ENV_DNS_PORT, 1053))
 
     args = parser.parse_args()