fix HsHa to respect max frame size
patch by Pavel Yaskevich; reviewed by Tyler Hobbs (CASSANDRA-4573)
add --migrate optionto sstableupgrade and sstablescrub
patch by Tyler Hobbs; reviewed by Jeremiah Jordan for CASSANDRA-5831
Merge branch 'cassandra-1.2' into cassandra-2.0.0
Merge branch 'cassandra-2.0.0' into cassandra-2.0
Merge branch 'cassandra-2.0' into trunk