Reviewed-by: ultrotter

Add instance tag handling, improved error logging.
...oh, yes adopt instance listing for RAPI2!

Reviewed-by: iustinp

This patch moves the CheckMaster function from ganeti-masterd to ssconf
(most logical place, it cannot go in utils since we would have recursive
imports between ssconf and utils) and changes ganeti-rapi to also call
this function.

This is needed so that starting ganeti-rapi on a non-master node does
the right thing.

Reviewed-by: ultrotter

Reviewed-by: imsnah

This is needed for controlling it cleanly with start-stop daemon.

Reviewed-by: ultrotter

Reviewed-by: iustinp

All other daemons have their main code in themselves and not in a module.
This patch does the same to ganeti-rapi by moving the code from
lib/rapi/RESTHTTPServer.py to daemons/ganeti-rapi.

Reviewed-by: iustinp

Reviewed-by: iustinp