pidgin/pidgin

Python2 is deprecated and not in current distros so move the dbus bindings to Python3

Testing Done:
Ran locally, everything _looks_ fine.

Reviewed at https://reviews.imfreedom.org/r/550/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "pidgin/pidgin"
REPOSITORY_TYPE = "mercurial"
BRANCH = "release-2.x.y"
LAND_DEST_BRANCH = "release-2.x.y"
LAND_PUSH = False