lxd-container: fix wrong path in the bootstrap script

roles/lxd-container/templates/bootstrap-container.sh.j2

@@ -30,6 +30,6 @@ echo "%passwordless-sudo ALL=(ALL:ALL) NOPASSWD:ALL" | \
 
 # Authorize the hypervisor manager to connect to the guest manager
 ex sudo -u manager mkdir -p /home/manager/.ssh
-cat /home/manager/.ssh/authorized_keys | \
+cat /etc/ssh/authorized_keys/manager | \
     ex sudo -u manager bash -c "cat > /home/manager/.ssh/authorized_keys"
 ex chmod 0600 /home/manager/.ssh/authorized_keys