Fix warnings in sal-akka-raft test classes

Fix warnings in sal-akka-raft test classes

Fixed checkstyle warnings in the test classes. 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)
 - variable name too short
 - indentation
 - removed use of JavaTestKit with embedded code (avoids
   having to indent code another 4 spaces). In most cases, JavaTestKit
   wasn't even used.
 - local vars/params hiding a field
 - putting overloaded methods close to one another
 - remove unused vars
 - convert functional interfaces to lambdas (eclipse save action)
 - empty catch block - added comment or Throwables.propagate as appropriate
 - missing period after first sentence in javadoc
 - missing first sentence in javadoc
 - adding final for locals declared too far from first usage

Change-Id: I5c522e5b0383b2c5e9b0b036dc444c51f788b650
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>