sysconfig: collective update

This update fixes the following issues for sysconfig:
- 737636: Enabled to always enable the -o boot under systemd, improved to use PID in log messages and extradebug outputs
- 741453: Filter out labeled ipv4 addresses in get_ipv4address used to fetch the 1st address from the TUNNEL_DEVICE interface. Allows to configure a label for each address that should be skipped.
- Updated ifcfg-tunnel.5 man page.

Fixed bugs
bnc#737636
network is started then stopped right away
bnc#741453
sysconfig: regression with ipv6 6to4 tunnels!
Selected Binaries
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