recommended update for netcfg

This recommended update for netcfg fixes the following issues:
- Redo the HOSTNAME -> hostname migration to support smallest possible step. Thus ensuring the migration is done just once and finished:
# HOSTNAME migration supported scenarios [bnc#858908]:
# /etc/HOSTNAME -> /etc/hostname content preservation.
# If hostname and HOSTNAME both exist HOSTNAME wins.
# Nothing apart from content of the document is preserved
- Solves bnc#858908 and bnc#899506 while moves bnc#887039 to unsupported scenarios.
- Remove the socket check from the defaultdomain checker as it was always false and thus not needed
- Drop the scriptlet for the netgroup handling. It was caused by the aaa_base -> netcfg move

Fixed bugs
bnc#899506
netcfg's rename of HOSTNAME breaks
bnc#858908
/etc/hostname vs. /etc/HOSTNAME confusion
bnc#887039
unnecessary write to /etc/HOSTNAME and/or /etc/hostname unnecessarily prevents netcfg installation
Selected Binaries
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