ACCUMULO-3132 setting TInfo's serialization value is much simpler
After discussing it with [~kturner], this change seems simpler and
supports 1.6.1 -> 1.6.0 revert of an upgrade. The unit test will
catch any re-generation of the file.
Merge remote branch 'origin/1.6.1-SNAPSHOT' into 1.6.1-SNAPSHOT