ADOOP-9643. org.apache.hadoop.security.SecurityUtil calls toUpperCase(Locale.getDefault()) as well as toLowerCase(Locale.getDefault()) on hadoop.security.authentication value. (markrmiller@gmail.com via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504966 13f79535-47bb-0310-9956-ffa450edef68
merge -c 1504970 from trunk to branch-2 to fix YARN-919. Document setting default heap sizes in yarn env.sh Contributed by Mayank Bansal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504971 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9688 merge r1500843 and r1500847, and HADOOP-9720 merge r1502301 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505005 13f79535-47bb-0310-9956-ffa450edef68
Revert the merge r1505005

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505009 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9688 merge r1500843 and r1500847 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505030 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9691. Merge r1501615 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505037 13f79535-47bb-0310-9956-ffa450edef68
Revert r1505037 to fix the commit text

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505039 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9720 merge r1502301 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505040 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9691. Merge r1501615 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505042 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9716. Merge r1504362 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505052 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9717. Merge r1504725 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505053 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9751. Merge r1505036 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1505059 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-7435-branch-2-gd