HADOOP-12792. TestUserGroupInformation#testGetServerSideGroups fails in chroot. Contributed by Eric Badger

(cherry picked from commit 6f03959e4dc0bc11030fd7e30a025447a4d6948a)

Conflicts:

	hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUserGroupInformation.java

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -50,6 +50,9 @@ Release 2.7.3 - UNRELEASED
     HADOOP-12772. NetworkTopologyWithNodeGroup.getNodeGroup() can loop
     infinitely for invalid 'loc' values (Kuhu Shukla via kihwal)
 
+    HADOOP-12792. TestUserGroupInformation#testGetServerSideGroups fails in
+    chroot (Eric Badger via jlowe)
+
 Release 2.7.2 - 2016-01-25
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUserGroupInformation.java

@@ -217,7 +217,8 @@ public class TestUserGroupInformation {
     }
     // get the groups
     pp = Runtime.getRuntime().exec(Shell.WINDOWS ?
-      Shell.WINUTILS + " groups -F" : "id -Gn");
+      Shell.WINUTILS + " groups -F"
+      : "id -Gn " + userName);
     br = new BufferedReader(new InputStreamReader(pp.getInputStream()));
     String line = br.readLine();