Native external hbase table access (select, IUD) changes.

-- IUD on external hbase tables is now enabled by default
-- predicates on native hbase tables can now be pushed down to
   hbase region server
-- traf varchar col maxlength is now 200K by default,
   can be changed by cqd max_character_col_size
-- executor handles column values length greater than 32K during
   move to/from JNI
-- error is correctly returned if data retrieved from hbase exceeds expected
   max row length
-- hbase column_create function now takes an expression/param as its
   column name operand

Change-Id: Ieb3fcabfebaa22008eff2a049fc1e2000e68861e