nova: Bump timeout-per-gb for BFV rebuild ops

This increases the timeout we use to wait for cinder to perform a
volume reimage. Since devstack is often running on a single machine
with non-production IO performance, we should bump this limit to avoid
hitting it before the rebuild completes.

Change-Id: Ie2663b951acb0c1a65597a39e032948764e6ae6a
1 file changed