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/create/org.hibernate.dialect.MySQLInnoDBDialect/AlfrescoCreate-UsageTables.sql

@@ -16,7 +16,7 @@ CREATE TABLE alf_usage_delta
     PRIMARY KEY (id),
     KEY fk_alf_usaged_n (node_id),
     CONSTRAINT fk_alf_usaged_n FOREIGN KEY (node_id) REFERENCES alf_node (id)
-) ENGINE=InnoDB;
+) ENGINE=InnoDB; -- (optional)
 
 --
 -- Record script finish