* fix/EE-1862/unable-to-stop-or-remove-stack workaround for var without default value in yaml file
* fix/EE-1862/unable-to-stop-or-remove-stack check yaml file
* fixed func and var names
* wrapper error and used bool for stringset
* UT case for createNetworkEnvFile
* UT case for %s=%s
* powerful StringSet
* wrapper error for extract network name
* wrapper all the return err
* store more env
* put to env file
* make default value None