Fix redundant import alias

Because these package names are short and they are unique, it can not conflict. So the import aliases that can be omitted and we should remove them.

plugins/ipam/host-local/backend/allocator/config.go

@@ -20,7 +20,7 @@ import (
 	"net"
 
 	"github.com/containernetworking/cni/pkg/types"
-	types020 "github.com/containernetworking/cni/pkg/types/020"
+	"github.com/containernetworking/cni/pkg/types/020"
 )
 
 // The top-level network config - IPAM plugins are passed the full configuration

plugins/ipam/static/main.go

@@ -25,7 +25,7 @@ import (
 	"github.com/containernetworking/cni/pkg/types/current"
 	"github.com/containernetworking/cni/pkg/version"
 
-	types020 "github.com/containernetworking/cni/pkg/types/020"
+	"github.com/containernetworking/cni/pkg/types/020"
 )
 
 // The top-level network config - IPAM plugins are passed the full configuration

plugins/meta/portmap/chain.go

@@ -19,7 +19,7 @@ import (
 	"strings"
 
 	"github.com/coreos/go-iptables/iptables"
-	shellwords "github.com/mattn/go-shellwords"
+	"github.com/mattn/go-shellwords"
 )
 
 type chain struct {