HBASE-8733 Update our hadoop2 in trunk and 0.95 to 2.0.5-alpha (We are currently 2.0.2)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1495853 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-323-trunk-gd