Add slf4j-log4j dependency in the test-suite component

This should fix a bunch of test failures.
Add slf4j-log4j to the test classpaths

This allows the tests to pass without requiring slf4j-log4j across the
board.
Fix slf4j-log4j artifact ID
Fix POMs to include slf4j-log4j and log4j as test dependencies
Merge pull request #381 from melissalinkert/slf4j-fixes

Add slf4j-log4j dependency in the test-suite component