get rid of IsVirtual
Merge remote-tracking branch 'upstream/master' into 119-is-virtual
merge with upstream
rename test suite
Merge pull request #54 from klyachin/119-is-virtual

get rid of IsVirtual field

network: get rid of IsVirtual field

The field IsVirtual is redundant in NetworkInfo and network.Info structs,
the value may be inferred from the value of VLANTag field.