Low: Remove ccm_transition, num_peers and cib_feature_revision from the CIB

• ccm_transition is irrelevant now that have_quorum is set by the crmd before passing the CIB to the PE
• num_peers doesn't do anything, since by the time it is used the size of the connected set is always equal
• the functionality of cib_feature_revision is far better achieved using schema validation

Mercurial revision: ef57bfa79198945ece73f12a50c94a6b3323f4cd