lxd/firewall/drivers/drivers/consts: Adds FilterIPv6All constant
lxd/firewall/drivers/drivers/consts: Adds FilterIPv6All constant

Indicator for allowing all IPv6 traffic to be blocked.

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

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