lxd/network: Add configurable BGP hold time
lxd/network: Add configurable BGP hold time

Signed-off-by: Uri Ivanov <06161a354f72fd055d1d42e22310930eb489bdd9@hotmail.com>

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