Merge pull request #14 from morbidrsa/nvme/002

This pull adds a new test-case to the nvme test group for testing big
discovery log pages.

It is inspired by a bug triggered in the user-space 'nvme discover' with
a non Linux target which set's an non 0 MDTS (Maximum Data Transfer
Size) value causing nvme cli to fail the discovery.

There isn't a userspace fix yet, but it's still a nice scalability test.