ACCUMULO-1626 fixed equals method in mutation
Merge remote-tracking branch 'origin/1.4.4-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	core/src/test/java/org/apache/accumulo/core/data/MutationTest.java
	core/src/test/java/org/apache/accumulo/core/data/OldMutation.java
Merge remote-tracking branch 'origin/1.5.1-SNAPSHOT'