IFP: Re-add the InfoPipe server
Related:
https://fedorahosted.org/sssd/ticket/2072
This commit only adds the responder and the needed plumbing. No DBus
related code is in yet.
(cherry picked from commit cb4d5b588e704114b7090678752d33512baa718e)
Conflicts:
src/conf_macros.m4
src/confdb/confdb.h