Introduce setEnvDefaults function

  * This function set default values of a environment variables
  object. Existing keys are not modifies, missed keys added.
  * Misc: remove common.msg since it's not supported at JenkinsMaster

PRODX-5224

Change-Id: I4cbe7c0b430f349f0fb6b4e5f26140f45c7f92be
1 file changed