Merge branch 'trunk-gd' of https://github.com/griddynamics/yhadoop-common into fb-HADOOP-9166-trunk-gd

Conflicts:
	hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java
Merge branch 'fb-YAHOO-214-BAK-trunk-gd' of https://github.com/griddynamics/yhadoop-common into fb-YAHOO-214-BAK-trunk-gd