Rewrite bzk service

- bzk service restart == bzk service stop && bzk service start
- Rename tag option by version on bzk service start
- Add --recreate options on bzk service restart which destroy container before restarting it

cli/bzk/config.go

@@ -26,6 +26,7 @@ type Config struct {
  DockerSock string `yaml:"docker_sock"`
  SCMKey string `yaml:"scm_key"`
  Registry string `yaml:"registry"`
+ Tag string `yaml:"tag"`
 
  MongoURI string `yaml:"mongo_uri"`
 }