Check all available Kwalitee metrics, and make sure the distribution passes them

[chrisnovakovic]

We currently check the Kwalitee metrics in Test::Kwalitee as part of t/local/kwalitee.t, but it'd also be good to check the extra metrics in Test::Kwalitee::Extra.

There are also some Kwalitee failures in Net-SSLeay that need to be fixed before the next stable release. (I tried to fix one of them in 6554e993, but rather embarrassingly messed it up...)