Update go-iptables library version

From 0.4.1 to 0.4.5.
In version 0.4.1, no error is returned by go-iptables when running
`iptables --version` or parsing its ouput fails (during
initialization). This leads to the library not being able to correctly
detect whether the iptables version supports `--wait`, which ultimately
can lead to a deadlock for the Antrea agent.

See coreos/go-iptables#69.

By updating the go-iptables version, we ensure that any such error will
be returned to Antrea, logged, and cause the Antrea agent to fail and
eventually restart.

It is unclear what can cause iptables version detection to fail but
because of the added logging, we will have a better shot at getting to
the root cause if it happens in production again.

Fixes #871

cmd/antrea-agent/agent.go

@@ -90,6 +90,9 @@ func run(o *Options) error {
 		EnableIPSecTunnel: o.config.EnableIPSecTunnel}
 
 	routeClient, err := route.NewClient(o.config.HostGateway, serviceCIDRNet, encapMode)
+	if err != nil {
+		return fmt.Errorf("error creating route client: %v", err)
+	}
 
 	// Create an ifaceStore that caches network interfaces managed by this node.
 	ifaceStore := interfacestore.NewInterfaceStore()

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/containernetworking/plugins v0.8.2-0.20190724153215-ded2f1757770
 	github.com/contiv/libOpenflow v0.0.0-20200424005919-3a6722c98962
 	github.com/contiv/ofnet v0.0.0-00010101000000-000000000000
-	github.com/coreos/go-iptables v0.4.1
+	github.com/coreos/go-iptables v0.4.5
 	github.com/davecgh/go-spew v1.1.1
 	github.com/elazarl/goproxy v0.0.0-20190911111923-ecfe977594f1 // indirect
 	github.com/evanphx/json-patch v4.5.0+incompatible // indirect

go.sum

@@ -80,6 +80,8 @@ github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc
 github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
 github.com/coreos/go-iptables v0.4.1 h1:TyEMaK2xD/EcB0385QcvX/OvI2XI7s4SJEI2EhZFfEU=
 github.com/coreos/go-iptables v0.4.1/go.mod h1:/mVI274lEDI2ns62jHCDnCyBF9Iwsmekav8Dbxlm1MU=
+github.com/coreos/go-iptables v0.4.5 h1:DpHb9vJrZQEFMcVLFKAAGMUVX0XoRC0ptCthinRYm38=
+github.com/coreos/go-iptables v0.4.5/go.mod h1:/mVI274lEDI2ns62jHCDnCyBF9Iwsmekav8Dbxlm1MU=
 github.com/coreos/go-oidc v2.1.0+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=