common: Don't umount before cleaning package cache
common: Don't umount before cleaning package cache

The virtual FS got umounted before the clear_package_cache which was a
mistake as yum requires /dev to work.

redhat-cip/edeploy,redhat-cip/edeploy,enovance/edeploy,lebauce/edeploy,lebauce/edeploy,redhat-cip/edeploy,enovance/edeploy,lebauce/edeploy,enovance/edeploy,lebauce/edeploy,enovance/edeploy,redhat-cip/edeploy