refact(csi): use common lib-csi imports (#263)

Signed-off-by: shubham <shubham.bajpai@mayadata.io>

pkg/common/helpers/helpers.go

@@ -1,45 +0,0 @@
-/*
-Copyright 2020 The OpenEBS 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 helpers
-
-import (
-	"strings"
-)
-
-// GetCaseInsensitiveMap coercs the map's keys to lower case, which only works
-// when unicode char is in ASCII subset. May overwrite key-value pairs on
-// different permutations of key case as in Key and key. DON'T force values to the
-// lower case unconditionally, because values for keys such as mountpoint or
-// keylocation are case-sensitive.
-// Note that although keys such as 'comPREssion' are accepted and processed,
-// even if they are technically invalid, updates to rectify such typing will be
-// prohibited as a forbidden update.
-func GetCaseInsensitiveMap(dict *map[string]string) map[string]string {
-	insensitiveDict := map[string]string{}
-
-	for k, v := range *dict {
-		insensitiveDict[strings.ToLower(k)] = v
-	}
-	return insensitiveDict
-}
-
-// GetInsensitiveParameter handles special case ofGetCaseInsensitiveMap looking up one
-// key-value pair only
-func GetInsensitiveParameter(dict *map[string]string, key string) string {
-	insensitiveDict := GetCaseInsensitiveMap(dict)
-	return insensitiveDict[strings.ToLower(key)]
-}