[Pacemaker] Enable remote monitoring

[Gao,Yan]

Hi,
Here's the code for supporting nagios plugins in lrmd:

https://github.com/gao-yan/pacemaker/commits/nagios

A new resource class "nagios" is introduced.

Actions:

- probe: A resource defined for a resource container is not probed. (We
can also add a condition in pengine to just avoid probing a nagios class
resource.)

- start: Invokes the nagios plugin with specified parameters (Maps the
instance attributes to the long options of the nagios plugin). If it
returns non-OK, re-invokes it after some delay (delay = start_timeout /
10),  until it returns OK or exceeds the start timeout.

- monitor: Recurring invocation to the nagios plugin with specified
parameters.

- stop: Nothing special is done. The recurring monitor is canceled anyway.

- metadata: Reads the corresponding metadata from a xml file in
NAGIOS_METADATA_DIR.

(As we know nagios plugins don't support metadata. The current plan is
to generate the corresponding metadata according to the help of the
plugins, and put them into NAGIOS_METADATA_DIR for use -- Dejan already
has progress on this. Thank, Dejan!)


For nagios plugins, the exit code are:

STATE_OK        = 0,
STATE_WARNING   = 1,
STATE_CRITICAL  = 2,
STATE_UNKNOWN   = 3,
STATE_DEPENDENT = 4,

AFAICS, STATE_OK should map to PCMK_EXECRA_OK, and the others should all
belong to PCMK_EXECRA_UNKNOWN_ERROR. Well, apparently, there's no code
to express "NOT_RUNNING" in nagios plugins. I think it should be  fine,
since there's no probe.

Any suggestions are appreciated!

Thanks,
  Gao,Yan

-- 
Gao,Yan <ygao at suse.com>
Software Engineer
China Server Team, SUSE.

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