Remove some noop-code to make backporting easier.
Read env vars in readStartupConfig() to make them work in yum.conf. BZ 1102575
Have check provides check directly against the rpm index, and then quit.
Strip space in _rid() to make translations easier.
Fixup rid unknown subst. for previous i18n patch.
Call systemd Inhibit, to inhibit shutdowns during transactions. BZ 1109930.
Add cli specific info. for inhibit. BZ 1109930.
Read FS yumvars before yum.conf setup, and reread if installroot changed.
Fix merge typo. with FS vars. before yum.conf