[mce] Add support for CPU keepalive during transaction

This uses MCE's D-Bus CPU keepalive interface to make sure the
device does not go to sleep when packagekit is working on something.
[autotools] ./autogen.sh configure script regenerating extravaganza

Automatically autorunning ./autogen.sh on a auto Fedora autosystem with
gobject-introspection-devel autoinstalled, because this is autopparently
what it takes for autotools to autocorrectly re-autogenerate the auto
configure auto script.