Use lxc clone by default

provider/local/export_test.go

 // Copyright 2013 Canonical Ltd.
 // Licensed under the AGPLv3, see LICENCE file for details.
 package local
 
 import (
         "github.com/juju/testing"
         gc "launchpad.net/gocheck"
 
         "launchpad.net/juju-core/environs/config"
 )
 
 var (
         CheckIfRoot      = &checkIfRoot
         CheckLocalPort   = &checkLocalPort
         DetectAptProxies = &detectAptProxies
         FinishBootstrap  = &finishBootstrap
         Provider         = providerInstance
-        ReleaseVersion   = &releaseVersion
-        UseFastLXC       = useFastLXC
         UserCurrent      = &userCurrent
 )
 
 // ConfigNamespace returns the result of the namespace call on the
 // localConfig.
 func ConfigNamespace(cfg *config.Config) string {
         env, _ := providerInstance.Open(cfg)
         return env.(*localEnviron).config.namespace()
 }
 
@@ skipping 16 matching lines @@
 }
 
 // MockAddressForInterface replaces the getAddressForInterface with a function
 // that returns a constant localhost ip address.
 func MockAddressForInterface() func() {
         return testing.PatchValue(&getAddressForInterface, func(name string) (string, error) {
                 logger.Debugf("getAddressForInterface called for %s", name)
                 return "127.0.0.1", nil
         })
 }