fix Oracle DDL to use varchar2 and fix alter statements

alter statements (at least in oracle 11g or earlier) do not allow the
COLUMN keyword after ADD in an ALTER statement
Conflicts:
	src/database/upgrade/23/openfire_oracle.sql

src/database/upgrade/22/openfire_oracle.sql

 // add columns for SASL SCRAM-SHA-1
-ALTER TABLE ofUser ADD COLUMN storedKey VARCHAR(32);
-ALTER TABLE ofUser ADD COLUMN serverKey VARCHAR(32);
-ALTER TABLE ofUser ADD COLUMN salt VARCHAR(32);
-ALTER TABLE ofUser ADD COLUMN iterations INTEGER;
+ALTER TABLE ofUser ADD storedKey VARCHAR2(32);
+ALTER TABLE ofUser ADD serverKey VARCHAR2(32);
+ALTER TABLE ofUser ADD salt VARCHAR2(32);
+ALTER TABLE ofUser ADD iterations INTEGER;
 
 UPDATE ofVersion SET version = 22 WHERE name = 'openfire';