`vm_instance` table's id column is unique but does not auto_increment like other
resource tables. The fix simply alter the table's id column to have it
auto_increment which may avoid id conflicts in a multi-master mysql setup.
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
(cherry picked from commit e1e5e12aaa649c05f2d5bebe1bdaec00e284dcf0)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>