lxd/util/net: Update IsAddressCovered to use net.IP when comparing IP equality
lxd/util/net: Update IsAddressCovered to use net.IP when comparing IP equality

Using strings is problematic when the same IP can have multiple different presentations.

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

lxc/lxd,atxwebs/lxd,hallyn/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,atxwebs/lxd,atxwebs/lxd,lxc/lxd,lxc/lxd,lxc/lxd,atxwebs/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd