Feature: crm_resource: Implement resource reload and restart commands

For resource reload, it's done by tickling the "op-digest" of the "last_0" lrm_rsc_op where the resource is running. And tickling "op-restart-digest" for resource restart.

-- I was about to push this. But suddenly i saw : https://github.com/beekhof/pacemaker/commit/aa12ff6f946f1cfd4cf28a5e1cdc84dd000ec5af

Anyway, please take a look. We'd still need the reload command ;-)