Create index DDL should be added to oracle-jbpm-schema.sql

Description of problem:
Create index DDL should be added to oracle-jbpm-schema.sql in order to prevent a dead lock in DB.

Create index DDL is CREATE INDEX IDX_EVENTTYPES ON EVENTTYPES (INSTANCEID);. It is described in Bug 854612.

And oracle-jbpm-schema.sql is in /brms-src/jbpm/jbpm-installer/db/ddl-scripts/oracle/oracle-jbpm-schema.sql in jboss-bpms-brms-6.0.3.GA-redhat-1-src.zip.

Version-Release number of selected component (if applicable):
jbpm 6.0.3

Additional info: Bug 854612 - Missing index in EVENTTABLES table
https://bugzilla.redhat.com/show_bug.cgi?id=854612