Enhance TrailingSemicolon to warn on multiple semicolons

Improve the `TrailingSemicolon` linter to spot double semicolons.

Change-Id: I161334c85c7b9d9bcf18e8f446ed9a704d07828b
Reviewed-on: http://gerrit.causes.com/42573
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>