Run the plugin coldplug methods in a predictable order
Run the plugin coldplug methods in a predictable order

When reading with g_dir_read_name() the returned files do not have to be sorted
in any particular order and could even change between invokation. This patch
makes debugging the interactions between plugins much easier.

hughsie/fwupd,superm1/fwupd,superm1/fwupd,fwupd/fwupd,fwupd/fwupd,vathpela/fwupd,fwupd/fwupd,hughsie/fwupd,vathpela/fwupd,hughsie/fwupd,hughsie/fwupd,vathpela/fwupd,vathpela/fwupd,superm1/fwupd,fwupd/fwupd