LPXXX Replace XMPP with Redis (C & Perl)

LPXXX Replace XMPP with Redis (C & Perl)

* Use Redis streams / consumer groups
* Includes modified opensrf_core.xml example file
* adds message bus management to opensrf-perl.pl
* Adds public services filter to gateway / websocket translator
* Readme for install

TODO

* Modify install makefiles
* Modify base INSTALL docs
* Trim opensrf_core.xml.example to avoid refs to Evergreen services
  and move the current one to Evergreen.
* Consider if/how/when we want to use redis NOACK / XACK.
* add logfile support back to opensrf_core.xml.exmple
* more, i'm sure

Signed-off-by: Bill Erickson <berickxx@gmail.com>