bump up client-go to release-5.0 and vendor kubernetes/api

Fixes #178

* Move getNodeIP logic to utils package

Remove redundant ipset lookups

utils.NewIPSet() does this for us.

* Don't masquerade pod -> nodeAddrsIPSet traffic

Previously with Pod egress enabled, this would get masqueraded.
This change also adds cleanup for said ipset.

* Enhanced cleanup of Pod egress, overlay networking

- Delete old/bad pod egress iptables rule(s) from old versions
- When pod egress or overlay are disabled, cleanup as needed

* Update IPSet.Sets to map type

* ipset enhancements

- Avoid providing method that would delete all ipset sets on a system
- New method DestroyAllWithin() destroys sets tracked by an IPSet
- Create() now handles cases where Sets/System state are not in sync
- Refresh() now handles leftover -temp set gracefully
- Swap() now uses ipset swap
- Delete() improved sync of Sets and system state
- Get() now validates if map element exists before trying
- etc

* Update routes controller to reflect ipset changes

* Cleanup ipset create function + restore. Fix #176

Switch from array to map to simplify set use

* Add sets initialization on create

"kube-router.io/..."
This is in line with convention set by k8s upstream.

Delete ipset dependency + delete unused ipsets

* Add --peer-router-password option
Also:
- Consolodated NRC peer fields into a []config.NeighborConfig
  to store address, asn, and password for each peer.
- BREAKING: --peer-router and --peer-asn flags now take slices
  rather than strings.

* Add password auth node annotation for external peer

* Update documentation

New CLI flags and annotations
Renamed ones as well

* Consistent CLI flags, annotations, and peer config

BGP configs now all accept multiple values and are treated consistently.
Other refactoring was done as well.

* Stop bgpserver on peering errors to avoid listener leak

* Clarify BGP doc sections

Fix some typos

* bgpserver: listen only on enabled address protocols
* tiny typo fix
* Ensure gobgp server listener gets closed

* Fix IPVS persistence flag

* Improve service proxy logging

* Fix Destination string

* Enhanced ipvs ServiceFlags handling

Adding ability to disable IP-in-IP tunnelining

where nodes are in different subnet. With tunneling disabled its expected that default
gateway has learned the pod CIDR's allocated for all the nodes and can route the
pod-to-pod traffic across nodes in different subnets

Fixes #119

Kube-proxy like behaviour to listen on all ip's for NodePort service.

NodePort service listens on all ip/interfaces in case of kube-proxy. Currently kube-router listens only on node IP.
This fix introduces flag nodeport-bindon-all-ip with which you can have kube-proxy like behaviour. If not specified
only nodeIP will be open for connections.

Fixes #139

fixing gofmt, go_vet, gocyclo, golint errors

Setup policy-based routing so that traffic arriving on a tunnel interface leaves on same tunnel interface irrespective of rp_filter value

Setup policy-based routing so that traffic arriving on a tunnel interface leaves on same tunnel interface irrespective of rp_filter value

    - ip rule to lookup custom route table for packets arriving from the pods
    - in the custom route table add route to route traffic to remote node through tunnel interface

Fixes #138

fix gofmt, go_vet, misspells

Enable netfilter for bridge, a must requirement for all CNI that use bridge

https://kubernetes.io/docs/concepts/cluster-administration/network-plugins/#network-plugin-requirements

Fixes #141

Add build-image folder, which allows to build kube-router on mac os

Consolidate multiple stop channels into one

NetworkPolicy: Fix e2e test failures