recommended update for dhcp

This recommended update for dhcp fixes the following issues:

- Applied fix to not crash in interface discovery when the interface address is NULL (bsc#909189,bsc#870535).
- Disabled explicit gpg validation; osc source_validator does it.

Fixed bugs
bnc#909189
[regression] dhclient crashes
bnc#870535
Mellanox fixes for DHCP over IPoIB
Selected Binaries
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