Fix 500 error on invalid security-group-rule creation for NVP

Fix 500 error on invalid security-group-rule creation for NVP

Validate that, when creating rules specifying a protocol different
from TCP, UDP, ICMP and ICMPv6, no port (range) is specified because
NVP does not like it.

The extra validation is specific to the NVP plugin because other
plugins may choose a different failure mode. For example, the ovs
plugin does not complain at all, but it just ignores the port range
if the protocol is not a port-oriented one.

Fixes bug #1213293

Change-Id: I46e9032b5cf7f7d88b9d05c3bf020784b04217d9