Move constants.DefaultBundlePath to generic code

At the moment it's duplicated 3 times in os specific files, but it's
always set to the same value, so we can move it to the common
constants.go. GetDefaultBundle() is what will differ on the various OS.

pkg/crc/constants/constants.go

@@ -37,6 +37,7 @@ var (
 	MachineCacheDir    = filepath.Join(MachineBaseDir, "cache")
 	MachineInstanceDir = filepath.Join(MachineBaseDir, "machines")
 	GlobalStatePath    = filepath.Join(CrcBaseDir, GlobalStateFile)
+	DefaultBundlePath  = filepath.Join(CrcBaseDir, GetDefaultBundle())
 	bundleEmbedded     = "false"
 )
 

pkg/crc/constants/constants_darwin.go

@@ -3,18 +3,13 @@ package constants
 import (
 	"fmt"
 	"github.com/code-ready/crc/pkg/crc/version"
-	"path/filepath"
 )
 
 const (
 	OcBinaryName = "oc"
 	DefaultOcURL = "https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/macosx/oc.tar.gz"
 )
 
-var (
-	DefaultBundlePath = filepath.Join(CrcBaseDir, GetDefaultBundle())
-)
-
 func GetDefaultBundle() string {
 	return fmt.Sprintf("crc_hyperkit_%s.crcbundle", version.GetBundleVersion())
 }

pkg/crc/constants/constants_linux.go

@@ -3,18 +3,13 @@ package constants
 import (
 	"fmt"
 	"github.com/code-ready/crc/pkg/crc/version"
-	"path/filepath"
 )
 
 const (
 	OcBinaryName = "oc"
 	DefaultOcURL = "https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/linux/oc.tar.gz"
 )
 
-var (
-	DefaultBundlePath = filepath.Join(CrcBaseDir, GetDefaultBundle())
-)
-
 func GetDefaultBundle() string {
 	return fmt.Sprintf("crc_libvirt_%s.crcbundle", version.GetBundleVersion())
 }

pkg/crc/constants/constants_windows.go

@@ -3,18 +3,13 @@ package constants
 import (
 	"fmt"
 	"github.com/code-ready/crc/pkg/crc/version"
-	"path/filepath"
 )
 
 const (
 	OcBinaryName = "oc.exe"
 	DefaultOcURL = "https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/windows/oc.zip"
 )
 
-var (
-	DefaultBundlePath = filepath.Join(CrcBaseDir, GetDefaultBundle())
-)
-
 func GetDefaultBundle() string {
 	// TODO: we will change once we have correct bundle for windows
 	return fmt.Sprintf("crc_hyperv_%s.crcbundle", version.GetBundleVersion())