Revert "[Reviewer Andy] Don't hairpin outgoing requests"
Merge pull request #717 from Metaswitch/revert-705-issue704

Revert "[Reviewer Andy] Don't hairpin outgoing requests"
Merge pull request #718 from Metaswitch/handlers_crash

[Reviewer: Matt] Fix crash in AuthTimeoutHandler
Don't hairpin outgoing requests
Fix UDP case
Fix compilation issue
Fixes to Accept-Contact/Reject-Contact handling - proper handling of boolean parameters, negation, and quoted-string comparison
Fixes to negation in token list matching
Plug code coverage gap
Brace style fixes
Change Metaswitch submodule refs to ClearwaterCore