The function was introduced in [0] using a hardcoded timeout of 60
seconds which turns out to be too small on slow machines. Create a new
global variable NOVA_READY_TIMEOUT instead so that users can
override the timeout if necessary.
[0] I32eb59b9d6c225a3e93992be3a3b9f4b251d7189
Co-Authored-By: Mohammed Naser <mnaser@vexxhost.com>
Change-Id: I0cd7f193589a1a0776ae76dc30cecefe7ba9e5db