bump version to 1.3.0.rc2
- Trac Ticket #497 - Escaped character cannot be used in the substring search filter
- Ticket 509 - lock-free access to be->be_suffixlock
- Trac Ticket #522 - betxn: upgrade is not implemented yet
(cherry picked from commit 8bfa1a31765764cadbfdefa898c760ff9b536ef2)