Add ConsecutiveComments linter

Add linter which checks for consecutive comments and recommends that
they be merged into a single multiline comment.

Change-Id: I2364ae3bf6617a5cc6617fc912389fd2268fa438
Reviewed-on: http://gerrit.causes.com/42353
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>