Fix regression in --require flag

This was broken by a refactor in d20b3c3ed. The problem was that we were
no longer `require`ing the path before attempting to reference the
reporter class.

Change-Id: I463f680d70461c5fe4e7300b17e82a49095b49b1
Reviewed-on: http://gerrit.causes.com/45453
Tested-by: jenkins <jenkins@brigade.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>