Defer yumlock creation until runtime.
Defer yumlock creation until runtime.

At import time, the tg.config hasn't yet been populated, so our config
value has no effect.

Tested in staging.

fedora-infra/fedora-packages,fedora-infra/fedora-packages,Fale/fedora-packages,Fale/fedora-packages,Fale/fedora-packages,fedora-infra/fedora-packages,fedora-infra/fedora-packages