lxd: Check metrics certificates
lxd: Check metrics certificates

Allow metrics certificates for the endpoints /1.0 and /1.0/metrics.

Signed-off-by: Thomas Hipp <5f82c492b3b00e427412d216ce820707a10c51ce@canonical.com>

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