HADOOP-10820. Throw an exception in GenericOptionsParser when passed an empty Path. Contributed by Alex Holmes and Zhihai Xu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1617542 13f79535-47bb-0310-9956-ffa450edef68
YARN-2373. Changed WebAppUtils to use Configuration#getPassword for accessing SSL passwords. Contributed by Larry McCay

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1617555 13f79535-47bb-0310-9956-ffa450edef68