use gopkg.in/yaml.v2 instead of v3

Many dependencies already import gopkg.in/yaml.v2, podman is the only
user of the v3 version except  github.com/stretchr/testify but this is
only a testing dependency so it will not end up in the binary.

This change reduces the podman binary size from 54740 to 54260 KB on my
system.

[NO NEW TESTS NEEDED]

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

go.mod

@@ -69,7 +69,7 @@ require (
 	golang.org/x/sys v0.0.0-20220128215802-99c3d69c2c27
 	golang.org/x/text v0.3.7
 	google.golang.org/protobuf v1.27.1
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
+	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.22.5
 	k8s.io/apimachinery v0.22.5
 )

pkg/domain/infra/abi/play.go

@@ -28,7 +28,7 @@ import (
 	"github.com/ghodss/yaml"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
-	yamlv3 "gopkg.in/yaml.v3"
+	yamlv2 "gopkg.in/yaml.v2"
 	v1apps "k8s.io/api/apps/v1"
 	v1 "k8s.io/api/core/v1"
 )
@@ -655,7 +655,7 @@ func readConfigMapFromFile(r io.Reader) (v1.ConfigMap, error) {
 func splitMultiDocYAML(yamlContent []byte) ([][]byte, error) {
 	var documentList [][]byte
 
-	d := yamlv3.NewDecoder(bytes.NewReader(yamlContent))
+	d := yamlv2.NewDecoder(bytes.NewReader(yamlContent))
 	for {
 		var o interface{}
 		// read individual document
@@ -669,7 +669,7 @@ func splitMultiDocYAML(yamlContent []byte) ([][]byte, error) {
 
 		if o != nil {
 			// back to bytes
-			document, err := yamlv3.Marshal(o)
+			document, err := yamlv2.Marshal(o)
 			if err != nil {
 				return nil, errors.Wrapf(err, "individual doc yaml could not be marshalled")
 			}

vendor/modules.txt

@@ -881,9 +881,9 @@ gopkg.in/square/go-jose.v2/json
 # gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7
 gopkg.in/tomb.v1
 # gopkg.in/yaml.v2 v2.4.0
+## explicit
 gopkg.in/yaml.v2
 # gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
-## explicit
 gopkg.in/yaml.v3
 # k8s.io/api v0.22.5
 ## explicit