Merge r1722177, r1722195, r1722229, r1722320, r1722328, r1722334, r1722350, r1722351, r1722358, r1722377, r1723953, r1724879, r1724992, r1724993, r1724995, r1725018, r1725031, r1725120, r1725328, r1725387, r1725489, r1725498, r1725499, r1725523, r1725545, r1725567, r1725581, r1725602, r1725822, r1725967, r1726038, r1726049, r1726051, r1726052, r1726055, r1725090, r1728326, r1737020 from trunk:

Commit framework impl of health-check module plus
required changes. The actual health checking is
currently in progress, but wanted to add in at
this stage.

Make aware of new status: Failed Health Check.
Store the number of current passes/fails in shm

finish looping logic... place-holder for actual checking

Better check

move to per server conf, useful for adding HealthCheckCondition

Now implement the condition ruleset definition. The
actual checking will be done in the actual health check
routine.

just check watched servers... use 'hc' prefix for sub directives

Check that we have names for both templates and
...