HDFS-5279. Guard against NullPointerException in NameNode JSP pages before initialization of FSNamesystem. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528308 13f79535-47bb-0310-9956-ffa450edef68
YARN-1260. Added webapp.http.address to yarn-default.xml so that default install with https enabled doesn't have broken link on NM UI. Contributed by Omkar Vinit Joshi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528312 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4310-trunk-gd