Update to newest imgcrypt, aufs and zfs

Older versions transitively dragged in k8s.io/kubernetes, the newer
versions do not.

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/containers/ocicrypt/config/keyprovider-config/config.go

@@ -0,0 +1,81 @@
+/*
+   Copyright The ocicrypt Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package config
+
+import (
+	"encoding/json"
+	"github.com/pkg/errors"
+	"io/ioutil"
+	"os"
+)
+
+// Command describes the structure of command, it consist of path and args, where path defines the location of
+// binary executable and args are passed on to the binary executable
+type Command struct {
+	Path string   `json:"path,omitempty"`
+	Args []string `json:"args,omitempty"`
+}
+
+// KeyProviderAttrs describes the structure of key provider, it defines the way of invocation to key provider
+type KeyProviderAttrs struct {
+	Command *Command `json:"cmd,omitempty"`
+	Grpc    string   `json:"grpc,omitempty"`
+}
+
+// OcicryptConfig represents the format of an ocicrypt_provider.conf config file
+type OcicryptConfig struct {
+	KeyProviderConfig map[string]KeyProviderAttrs `json:"key-providers"`
+}
+
+const ENVVARNAME = "OCICRYPT_KEYPROVIDER_CONFIG"
+
+// parseConfigFile parses a configuration file; it is not an error if the configuration file does
+// not exist, so no error is returned.
+func parseConfigFile(filename string) (*OcicryptConfig, error) {
+	// a non-existent config file is not an error
+	_, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return nil, nil
+	}
+
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	ic := &OcicryptConfig{}
+	err = json.Unmarshal(data, ic)
+	return ic, err
+}
+
+// getConfiguration tries to read the configuration file at the following locations
+// ${OCICRYPT_KEYPROVIDER_CONFIG} == "/etc/ocicrypt_keyprovider.yaml"
+// If no configuration file could be found or read a null pointer is returned
+func GetConfiguration() (*OcicryptConfig, error) {
+	var ic *OcicryptConfig
+	var err error
+	filename := os.Getenv(ENVVARNAME)
+	if len(filename) > 0 {
+		ic, err = parseConfigFile(filename)
+		if err != nil {
+			return nil, errors.Wrap(err, "Error while parsing keyprovider config file")
+		}
+	} else {
+		return nil, nil
+	}
+	return ic, nil
+}