dnf_img_test
dnf: implement selectEnvironment()
dnfpayload: keyerror in isRepoEnabled
DNF payload: disable all NSS operations in RPM.

Due to a serious problem with NSS and fork() the Payload will have to do without
crypto.

Related:RhBug:1006280
DNF Payload: log when the transaction process unexpectedly terminates.
debugging: dnfpayload.py
Revert "Convert makeupdates from getopt to argparse"

This reverts commit 34712c368f0c400f1b0f0a2972f5586f6184b796.