Fix POD encoding in check_rbl.

Closes: #724175
Thanks: David Suárez
Run dh_python2 for plugins and normal modules.
Add check_graphite.
Auto update of debian/copyright
Auto update of debian/control
Merge remote-tracking branch 'github/master'
Revert accidentally merged, duplicated bugfix.

This reverts commit 98008e4aea3687cff8c7ab3f871809e219591cde.