def grant(perm, group_list = [])
      validate_usergroup_list(group_list)
      api.post(['grant', perm].uri_concat, group_list, 'application/json')
    end
def grant(perm, group_list = [])
      validate_usergroup_list(group_list)
      api.post(['grant', perm].uri_concat, group_list, 'application/json')
    end
POST /api/v2/usergroup/grant/{permission}
 Grants a single permission to user group(s)

 @param perm [String] permission to grant
 @param group_list [Array[String]] list of groups who should
   receive permission
 @return [Wavefront::Response]