This patch fixes some filtering combinations issues which does not
work on the 'master' version:

    $ ss -4
    shows inet & unix sockets, instead of only inet sockets

    $ ss -u
    needs to specify 'state closed'

    $ ss src unix:*X11*
    needs to specify '-x' shortcut for UNIX family

    $ ss -A all
    shows only sockets with established states

There might some other issues which was not observed.

Also changed logic for calculating families, socket types and
states filtering. I think that this version is a little simpler
one. Now there are 2 predefined default tables which describes
the following maping:

    family  -> (states, dbs)
    db      -> (states, families)
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>