Enhance Nic.master for ovs virtual switches [1/2]

Add a test to check whether an interface is part of a ovs virtual switch.
This is to stop the network barclamp from reconfiguring such interfaces,
similar to what is already does for linux-bridge and bond slaves.



 chef/cookbooks/barclamp/libraries/nic.rb | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

Crowbar-Pull-ID: fe6235d7a36ecb5fb03d7dc3628236c4743f2296

Crowbar-Release: pebbles