[WIP] server: add support for sorting zones in UI/api

[yadvr]

Problem: Not able to configure a sort order for the zone that are listed in various views in the UI.
Root Cause: There was no mechanism to accept sort key for existing zones or UI widget to drag them in a certain order.
Solution: The order can now be configured through the editZone API by providing sort_key parameter for zones, or by reordering the zones in the Zones list in the UI. Database changes include updating table “data_center” which contains the “sort_key” column containing integer values and defaults to zero.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)

[yadvr]

@borisstoyanov @PaulAngus hold testing until master is available again. This introduces an upgrade path that is missing between 4.12 and 4.13. The sql changes are:

DROP PROCEDURE IF EXISTS `cloud`.`IDEMPOTENT_ADD_COLUMN`;

CREATE PROCEDURE `cloud`.`IDEMPOTENT_ADD_COLUMN` (
		IN in_table_name VARCHAR(200)
    , IN in_column_name VARCHAR(200)
    , IN in_column_definition VARCHAR(1000)
)
BEGIN

    DECLARE CONTINUE HANDLER FOR 1060 BEGIN END; SET @ddl = CONCAT('ALTER TABLE ', in_table_name); SET @ddl = CONCAT(@ddl, ' ', 'ADD COLUMN') ; SET @ddl = CONCAT(@ddl, ' ', in_column_name); SET @ddl = CONCAT(@ddl, ' ', in_column_definition); PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt; END;

-- Add sort_key to data_center
CALL `cloud`.`IDEMPOTENT_ADD_COLUMN`('cloud.data_center', 'sort_key', 'INT(32) NOT NULL DEFAULT 0');
DROP VIEW IF EXISTS `cloud`.`data_center_view`;
CREATE VIEW `cloud`.`data_center_view` AS
    select
        data_center.id,
        data_center.uuid,
        data_center.name,
        data_center.is_security_group_enabled,
        data_center.is_local_storage_enabled,
        data_center.description,
        data_center.dns1,
        data_center.dns2,
        data_center.ip6_dns1,
        data_center.ip6_dns2,
        data_center.internal_dns1,
        data_center.internal_dns2,
        data_center.guest_network_cidr,
        data_center.domain,
        data_center.networktype,
        data_center.allocation_state,
        data_center.zone_token,
        data_center.dhcp_provider,
        data_center.removed,
        data_center.sort_key,
        domain.id domain_id,
        domain.uuid domain_uuid,
        domain.name domain_name,
        domain.path domain_path,
        dedicated_resources.affinity_group_id,
        dedicated_resources.account_id,
        affinity_group.uuid affinity_group_uuid
    from
        `cloud`.`data_center`
            left join
        `cloud`.`domain` ON data_center.domain_id = domain.id
            left join
        `cloud`.`dedicated_resources` ON data_center.id = dedicated_resources.data_center_id
            left join
        `cloud`.`affinity_group` ON dedicated_resources.affinity_group_id = affinity_group.id; 

[yadvr]

Moved: #3242