Fix the way how pci bus ids are compared [1/2]

This should make network interface maps in the network proposal  work for
busids like: 0000:00/0000:00:03.0/0000:01:02.1

The patches try to maintain backwards compatibility with the old code as much
as possible.


 .../barclamp/libraries/barclamp_library.rb         | 27 ++++++++++++++++++----
 1 file changed, 22 insertions(+), 5 deletions(-)

Crowbar-Pull-ID: 03587f33beb579f50a699eb0e5b877e7f42332a7

Crowbar-Release: pebbles