Bug fixes and minor improvements

Fixed weave-npc crash from Succeeded/Failed pods #2632,#2658
Fixed occasional failure to create Weave bridge on node reboot #2617,#2637
Fixed a bug where weave-kube would fail to install when run with unreleased snapshot builds #2642
Improved conformance to CNI spec by not releasing IP addresses when a container dies #2643
Improved troubleshooting of install failure by creating CNI config after Weave Net is up #2570
"up to date" shown even when the version check was blocked by firewall #2537,#2565,#2645
"Unable to claim" message on re-launching Weave after using CNI #2548,#2577
Eliminated spurious IP reclaim operations when IPAM was disabled #2567,#2644
Include jq tool in our build VM configuration #2656

Upgrading weave-kube

Kubernetes does not currently support rolling upgrades of daemon sets, so you will need to perform the procedure manually - see https://weave.works/docs/net/latest/kube-addon/ for details.