HBASE-8947 Thrift 2 : Replace "bool writeToWAL" with "TDurability durability" (Hamed Madani) - REAPPLY after REVERT

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1507205 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd