Fix: support of pygpgme with Python3
Fix: support of pygpgme with Python3

Removes unneeded code which depends on Python2.
Both python-gpg and pygpgme works with Python2 and Python3 now.

Tojaj/librepo,Tojaj/librepo,rpm-software-management/librepo,rpm-software-management/librepo,Tojaj/librepo,rpm-software-management/librepo