Add linter name to default reporter output

When getting a warning or error, it was sometimes difficult to tell
which linter it was just from the error message.

Include the actual name of the linter in the output to make this easier.

Change-Id: I7a2e1fd78495fe22870b5ca1394fce0aca5fdcec
Reviewed-on: http://gerrit.causes.com/42342
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>