Revert "shared/container: Updates IsRootDiskDevice to use same definition of rootfs as container_lxc"
Revert "shared/container: Updates IsRootDiskDevice to use same definition of rootfs as container_lxc"

This reverts commit b1842a979d1fa46b04b39cc4a38fe3c826c733b5.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

hallyn/lxd,hallyn/lxd,mjeanson/lxd,Skarlso/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,Skarlso/lxd,hallyn/lxd,atxwebs/lxd,lxc/lxd,lxc/lxd,Skarlso/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,atxwebs/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,lxc/lxd,atxwebs/lxd,lxc/lxd,lxc/lxd,mjeanson/lxd,lxc/lxd,Skarlso/lxd,hallyn/lxd,stgraber/lxd,mjeanson/lxd