pacemaker is not in meta-networking, and therefore dlm fails
to build when meta-cgl is not included, this changeset makes
the pacemaker dependency to be optional, and disabled by default
so users who have pacemaker in the bbfiles should enable pacemaker
support via a bbappend or setting it in config metadata
Signed-off-by: Khem Raj <raj.khem@gmail.com>
