lxd/networks/utils: Removes networkGetMacSlice function
lxd/networks/utils: Removes networkGetMacSlice function

Moved to network pkg.

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

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