Fix unit test CS warnings in sal-distributed-datastore

Fix unit test CS warnings in sal-distributed-datastore

Fixed checkstyle warnings in unit tests. Most of the
warnings/changes were for:
 - white space before if/for/while/catch
 - white space before beginning brace
 - line too long
 - illegal catching of Exception (suppressed)
 - illegal throwing of Throwable (changed to Exception)
 - variable name too short
 - indentation, mostly due to nested code inside anonymous JavaTestKit
   instances
 - separator wrapping: '.', '+', '&&' should be on a new line
 - local vars/params hiding a field
 - putting overloaded methods close to one another
 - remove unused vars
 - convert functional interfaces to lambdas (eclipse save action)
 - adding final for locals declared too far from first usage

Also 3 classes are no longer used so I removed them rather than fix warnings.

Change-Id: Ie1507e36c67a2b58f7efb62378212976b962f9fe
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>