azure: Wait for AssignPrivateIpAddresses() to complete
azure: Wait for AssignPrivateIpAddresses() to complete

This is an async operation, not waiting for it to complete will cause
recalculation of required addresses to happen too early and too many
addresses will be allocated.

Signed-off-by: Vlad Ungureanu <74f020a4111db471e6d40b8663c548673ce682e8@palantir.com>

tgraf/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,cilium-team/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,cilium-team/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium