fix: update ipam cidr when subnet changed

modify test problem for dual-stack upgrade

docs: add docs for vpc

upgrade for subnet

Co-authored-by: fanriming <fanriming@chinatelecom.cn>

fix typo

ci: update go version to 1.15

Fix: replace the command to run the script via 'sh' with 'bash'

Fix the default mtu parameter's describe

Although in most cases, 'sh' is a soft link to 'bash',
in some special operating systems, 'sh' points to 'dash',
and some scripts cannot be run through 'dash'.

add network policy adapt for dual-stack

feat: update ovn to 20.09

docs: prepare docs for 1.6.0 release

perf: add pprof to pinger

doc for dual-stack

Update the container nic name use the CNI_IFNAME parameter which passed by kubelet

The default CNI_IFNAME parameter passed by kubelet is "eth0", so we can use this.

Reference link: https://github.com/kubernetes/kubernetes/blob/88a05df5ff1b311e8e92f64b4f3a2c7d4329d14e/pkg/kubelet/dockershim/network/cni/cni.go#L398

ci: build multi arch image

<fix>(np) fix multi np rule and gateway bug

fix start-db.sh echo message

fix: iface check error