'Find a list of running servers in the provided group
:param module: the AnsibleModule object
:param datacenter: the clc-sdk.Datacenter instance to use to lookup the group
:param count_group: the group to count the servers
:return: list of servers, and list of running servers'

@staticmethod
def _find_running_servers_by_group(module, datacenter, count_group):

    group = ClcServer._find_group(module=module, datacenter=datacenter, lookup_group=count_group)
    servers = group.Servers().Servers()
    running_servers = []
    for server in servers:
        if ((server.status == 'active') and (server.powerState == 'started')):
            running_servers.append(server)
    return (servers, running_servers)
