Don't use a hardcoded port value.

It must be able to return the default port for a given protocol.
(i.e. http - 80, https - 443)

slapos/libnetworkcache.py

@@ -23,6 +23,7 @@ import urllib
 import urllib2
 import urlparse
 import M2Crypto
+import socket
 
 
 class NetworkcacheClient(object):
@@ -47,7 +48,9 @@ class NetworkcacheClient(object):
 
     return_dict['path'] = parsed_url.path
     return_dict['host'] = parsed_url.hostname
-    return_dict['port'] = parsed_url.port or 80
+    return_dict['port'] = parsed_url.port or \
+                           socket.getservbyname(parsed_url.scheme)
+
     return return_dict
 
   def __init__(self, shacache, shadir,