DB2 column 'id' autoincrement issue

[Chen Xiao]

When using DB2, Heat event record can not be inserted into table "Event", the root cause is that the ID column is supposed to be auto increasement but it is not. This column was set to auto increasement in 035_event_uuid_to_id.py with the statement:
event_table.c.tmp_id.alter(sqlalchemy.Integer, autoincrement=True)
For DB2, setting "ID" colume "autoincrement=True" can't make sense after above "tmp_id=>id" transformation,
so should work around it.

reproduce steps:
Using DB2 as heat database backend.

[root@control-node ~]# heat create wordpress1 --template-file=heat-templates/cfn/F17/getting_started.template --parameters="KeyName=root_key"
 Will found it will try to insert null value to column 'id' in table 'event'.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/92073
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=a4336ae1ae3cdade866da06a3eb435d02c7b12f2
Submitter: Jenkins
Branch: master

commit a4336ae1ae3cdade866da06a3eb435d02c7b12f2
Author: Chen Xiao <email address hidden>
Date: Mon Jun 16 18:36:08 2014 +0800

    Fix DB2 column 'id' autoincrement issue

    After installing heat against DB2, we can't insert data in table
    event, the reason is that "event_table.c.tmp_id.alter(
    sqlalchemy.Integer, autoincrement=True)" can't make sense after
    above "tmp_id=>id" transformation, Now need work around it.

    Change-Id: I50025fc5db87d458e660d42c773d799fc36f1b27
    Closes-Bug: #1316041