Use a constant for the version of admin-helper

earlier when parsing the version from the download URL
the version is changed implicitly based on the tag used
which doesn't reflect the version that is set on the binary

for tags we prefer to use the github style with a v infront
for the version in the binary we prefer to not use the v
so tag v0.0.11 corresponds to version 0.0.11, using the
crcAdminHelperVersion constant makes it explicit when bumping
admin-helper version

this fixes the following error on linux

```
unexpected version of the crc-admin-helper executable: crc-admin-helper-linux version mismatch: v0.0.11 expected but 0.0.11 found in the cache
```

pkg/crc/cache/cache.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	"path"
 	"path/filepath"
 	"strings"
 
@@ -70,7 +69,7 @@ func getVersionGeneric(executablePath string, args ...string) (string, error) {
 
 func NewAdminHelperCache() *Cache {
 	url := constants.GetAdminHelperURL()
-	version := path.Base(path.Dir(url))
+	version := version.GetAdminHelperVersion()
 	return New(constants.GetAdminHelperExecutable(),
 		url,
 		version,

pkg/crc/constants/constants.go

@@ -24,7 +24,7 @@ const (
 	DaemonLogFile             = "crcd.log"
 	CrcLandingPageURL         = "https://console.redhat.com/openshift/create/local" // #nosec G101
 	DefaultPodmanURLBase      = "https://storage.googleapis.com/libpod-master-releases"
-	DefaultAdminHelperCliBase = "https://github.com/code-ready/admin-helper/releases/download/v0.0.11"
+	DefaultAdminHelperURLBase = "https://github.com/code-ready/admin-helper/releases/download/v%s/%s"
 	CRCMacTrayDownloadURL     = "https://github.com/code-ready/tray-electron/releases/download/%s/crc-tray-macos.tar.gz"
 	CRCWindowsTrayDownloadURL = "https://github.com/code-ready/tray-electron/releases/download/%s/crc-tray-windows.zip"
 	DefaultContext            = "admin"
@@ -57,7 +57,7 @@ func GetAdminHelperExecutable() string {
 }
 
 func GetAdminHelperURLForOs(os string) string {
-	return fmt.Sprintf("%s/%s", DefaultAdminHelperCliBase, GetAdminHelperExecutableForOs(os))
+	return fmt.Sprintf(DefaultAdminHelperURLBase, version.GetAdminHelperVersion(), GetAdminHelperExecutableForOs(os))
 }
 
 func GetAdminHelperURL() string {

pkg/crc/version/version.go

@@ -44,6 +44,7 @@ const (
 	releaseInfoLink = "https://developers.redhat.com/content-gateway/rest/mirror/pub/openshift-v4/clients/crc/latest/release-info.json"
 	// Tray version to be embedded in executable
 	crcTrayElectronVersion = "1.2.7"
+	crcAdminHelperVersion  = "0.0.11"
 )
 
 type CrcReleaseInfo struct {
@@ -73,6 +74,10 @@ func GetPodmanVersion() string {
 	return podmanVersion
 }
 
+func GetAdminHelperVersion() string {
+	return crcAdminHelperVersion
+}
+
 func IsOkdBuild() bool {
 	return okdBuild == "true"
 }