Only NMIP[4,6]Config object was connected to signal on change. But when inner objects
(Addresses, Nameservers, Gateway) changed it doesn't notify us about this change.
Fix by connecting this inner properties too.
Resolves: *rhbz#1264400*
Reported-by: Marek Hruscak <mhruscak(a)redhat.com>
Master/F24 version of
https://github.com/rhinstaller/anaconda/pull/556 . On master we need
to disconnect signals so more code was required here.
(cherry picked from commit b9323749c470ca3ef24bfee82f911a7b85d8f7fe)
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To view this pull request on github, visit
https://github.com/rhinstaller/anaconda/pull/574