Added comments for LanItems::Read and ::ReadHw
LanItems is able to return names of all known netcards. bnc#578787

It returns really all netcards available and/or configured in the
system. It used to return configured only.
Testsuite for querying netcard names

Old fashioned
Created infrastructure and first test in Ruby / Minitest

Duplicates test for querying netcard device names.
Updated .gitignore
Updated changelog

Conflicts:
	VERSION
	package/yast2-network.changes