ACCUMULO-3078 ACCUMULO-3138 Remove the getStaticCluster reference again

The AccumuloConfiguration from the Instance is at least the
ClientConfiguration. We can use that to remove the reliance
on needing the shared MiniAccumuloCluster.
ACCUMULO-3144 Give the servers some time to flush out their buffers to the MAC log pipe.
ACCUMULO-3145 Fix loop invariants in listscans

Added some extra logging and (automatically) fixed formatting.
ACCUMULO-3146 Try to stabilize BalanceAfterCommsFailureIT and SimpleBalancerFairnessIT
ACCUMULO-3143 Offline scan property is now being properly serialized. Added verification that all other booleans are being serialized.
ACCUMULO-3142 Setting version to 1.6.1