Reorg table ml2_port_bindings when db migration

Reorg table ml2_port_bindings when db migration

For DB2, there are restrictions on table access
after ALTER TABLE statements containing
REORG-recommended operations.
Table will be placed in "reorg pending" state
after some continuous alter table operations.
Need run reorg table to make the table available.
More info refer to:
http://publib.boulder.ibm.com/infocenter/db2luw/v9/index.jsp
?topic=%2Fcom.ibm.db2.udb.admin.doc%2Fdoc%2Fc0023297.htm

Change-Id: I7fdd61bb4d636d7a3260c0b23152f1f3083cdcfd
Fixes: bug #1318498