Adding MySQL schema upgrade script for upgrading 4.0 stampede schema to use CASCADE DELETE natively. Fixes PM-646
Adding MySQL schema upgrade script for upgrading 4.0 stampede schema to use CASCADE DELETE natively. Fixes PM-646

pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus,pegasus-isi/pegasus