lxd/daemon: Load trusted server certs from local DB on startup using updateCertificateCacheFromLocal
lxd/daemon: Load trusted server certs from local DB on startup using updateCertificateCacheFromLocal

If no trusted server certs, then use network certificate as intra-cluster client certificate to allow upgrade to per-member server certificates as client certificates.

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

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