YARN-10321. Break down TestUserGroupMappingPlacementRule#testMapping into test scenarios

Contributed by Szilard Nemeth. Reviewed by Gergely Pollak.

Author: Prabhu Joseph

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/placement/UserGroupMappingPlacementRule.java

@@ -141,7 +141,7 @@ private ApplicationPlacementContext getPlacementForUser(String user)
           } else {
             if (LOG.isDebugEnabled()) {
               LOG.debug("Creating placement context for user {} using " +
-                  "static user static mapping", user);
+                  "current user static mapping", user);
             }
             return getPlacementContext(mapping);
           }
@@ -173,7 +173,7 @@ private ApplicationPlacementContext getPlacementForUser(String user)
           } else {
             if (LOG.isDebugEnabled()) {
               LOG.debug("Creating placement context for user {} using " +
-                  "static user static mapping", user);
+                  "current user static mapping", user);
             }
             return getPlacementContext(mapping);
           }