Schedule schema pull in onChange.

Patch by brandonwilliams, reviewed by Russ Hatch for CASSANDRA-6971
fix broken build
Non-droppable verbs shouldn't be dropped from OTC

patch by jasobrown; reviewed by Richard Low for CASSANDRA-6980
Shutdown batchlog executor in SS#drain()

patch by Sergio Bossa; reviewed by Aleksey Yeschenko for CASSANDRA-7025
Fix batchlog to account for CF truncation records

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for
CASSANDRA-6999
cqlsh: Updated CQL3 parser to support functions and BLOB literals

patch by Mikhail Stepura; reviewed by Aleksey Yeschenko for CASSANDRA-7018
Fix changelog