This update for lxd fixes the following issues:

- Add backport for which fixes a
Leap-specific kernel backport bug (close_range(2) was backported but not the
flags that it supported in the first version). boo#1186786

- Build lxd-agent and lxd-p2c statically to match upstream LXD build scripts
(and to make VMs work properly -- lxd-agent is injected into the VM).

Update to LXD 4.15. (boo#1186906)

The full upstream changelog is available from:
https://discuss.linuxcontainers.org/t/lxd-4-15-has-been-released/11252

+ Network interface hotplug in VMs
+ Configurable shutdown timeout
+ New persistent warnings (time skew, apparmor and virtiofsd)
+ Location field in /dev/lxd API
+ New type and name columns in lxc config trust list
+ Cluster members acting as database stand-by now visible
+ lxc monitor --pretty now supported with lifecycle events
+ New --expire flag for lxc publish
+ Requestor now recorded in lifecyle events
+ Proxy header support on main API endpoint
+ Full swagger coverage of REST API