ipdb: [regression fixed] do not lookup master in cache
ipdb: [regression fixed] do not lookup master in cache

This way it will always present, even fot detached interfaces, since the
cache is not updated yet.
tomislacker/python-iproute2,nazarewk/pyroute2,vodik/pyroute2,mtiny/pyroute2,drzaeus77/pyroute2,nazarewk/pyroute2,little-dude/pyroute2,nazarewk/pyroute2,tomislacker/python-iproute2,roolebo/pyroute2,roolebo/pyroute2,vodik/pyroute2,little-dude/pyroute2,little-dude/pyroute2,mtiny/pyroute2,simudream/pyroute2,simudream/pyroute2,drzaeus77/pyroute2