RA: Fixed the three pseudo RAs to use ha_pseudo_resource. Extended the Dummy RA to support checks for serialization and to survive the TERM signal.

As Alan pointed out, the pseudo RAs should be using the common
interface which has already been done in heartbeat/shellfuncs.

The Dummy RA has been expanded in order to support testing. First
use: LRM regression tests.

--HG--
extra : convert_revision : 97f81d18c5f4e308a25984539a6c454d681b1d87