Better fix for ALF-4431: Upgrade fails to create UsageDelta tables

- Investigation of previous attempt showed that the use of 'alternatives' was not going to work here
 - Pulled out all 'alf_usage_delta' creations from other upgrade scripts
 - Removed alternatives from patch 'patch.db-V3.4-UsageTables'
 - Added '--(optional)' at various locations to keep things sane
 - Tested 2.1.7, 2.2.x and clean bootstrap on MySQL


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@21979 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

config/alfresco/dbscripts/upgrade/2.2/org.hibernate.dialect.MySQLInnoDBDialect/upgrade-from-2.1.sql

@@ -445,39 +445,6 @@ INSERT INTO t_alf_node_assoc
 DROP TABLE alf_node_assoc;
 ALTER TABLE t_alf_node_assoc RENAME TO alf_node_assoc;
 
--- ----------------------------
--- Populate the Usage Deltas --
--- ----------------------------
-
-CREATE TABLE t_alf_usage_delta
-(
-   id BIGINT NOT NULL AUTO_INCREMENT,
-   version BIGINT NOT NULL, 
-   node_id BIGINT NOT NULL,
-   delta_size BIGINT NOT NULL,
-   INDEX fk_alf_usaged_n (node_id),
-   CONSTRAINT fk_alf_usaged_n FOREIGN KEY (node_id) REFERENCES t_alf_node (id),
-   PRIMARY KEY (id)
-) TYPE=InnoDB;
-
-INSERT INTO t_alf_usage_delta
-   (
-      id, version,
-      node_id,
-      delta_size
-   )
-   SELECT
-      ud.id, 1,
-      ud.node_id,
-      ud.delta_size
-   FROM
-      alf_usage_delta ud
-;                                                          -- (optional)
-
--- Clean up
-DROP TABLE alf_usage_delta;                                -- (optional)
-ALTER TABLE t_alf_usage_delta RENAME TO alf_usage_delta;
-
 -- -----------------------------
 -- Populate the Node Aspects --
 -- -----------------------------