Proto commits in fiorix/go-diameter

These 2 commits are when the Protocol Buffers files have changed:

Commit:6ee16e1
Author:Evgeniy Makeev
Committer:Alexandre Fiori

Merging in latest changes; Adding S6a Reset, Gx Credit Control definitions; Multi-protocol (sctp/tcp/...) bind support; Temp fix for backward incompatible sm.Settings format change (will be depreciated in the future); autogen.sh Linux fix and other minor fixes/changes.

The documentation is generated from this commit.

Commit:e9b5c3f
Author:Evgeniy Makeev
Committer:Alexandre Fiori

Go-Diameter fix for possible deadlocking in close notifier, additional S6a commands, examples & unit tests