Fix get_network_channel for BMCs that dislike 0xe
Fix get_network_channel for BMCs that dislike 0xe

For channel 0xe, we can skip checking if the channel
is active, since, obviously, we are connected to that
channel.  Since *current* active channel cannot be
inactive, assume that is good if seen.

Change-Id: I894bd27e6c76bb9ace0959566117ad6a6f8866ad

stackforge/pyghmi,openstack/pyghmi,openstack/pyghmi