sysconfig: several bugfixes

Following bugs were fixed in sysconfig:

- Fixed to differentiate ib/ibchild/bond runtime types to stop
ib bond interfaces correctly via ifdown-bond.
- Fixed ifup-bridge apply stp contstrains when STP is enabled
(bnc#753387)
- Fixed ifup-route to use -4/6 option for ip route and to not
require explicit dummy gateway for multicast routes in the
routes config (bnc#745252).

Fixed bugs
bnc#745252
ipv6: unable to set default route in ifroutes-<some interface>
bnc#753387
Default BRIDGE_FORWARDDELAY=0 causes networking problems with BRIDGE_STP=on
Selected Binaries
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