Revise libcufile recipe / fix tests.

[bdice]

This PR addresses several issues in the libcufile recipe. Changes include:

• etc/cufile.json and man were not being packaged correctly - these shouldn't go in the targets directory as I understand
• Need to skip ppc64le when migrator is enabled (fixed skip logic)
• Added more specific tests for package contents and moved tests to the top level (due to package name conflicts that otherwise prevent tests from running)
• Updated summary/description a bit (description was missing)

Tests are passing locally, so I'll open this PR. However, we have one TODO item that needs addressed: if we intend to package libcufile_rdma.so (which is only available on linux64 and not aarch64), we need to figure out how to supply the missing DSOs. See PR for details.

[jakirkham]

Thanks Bradley! 🙏

Added some comment about RDMA/verbs support below

[bdice]

@mroeschke @jakirkham I think all the requests are addressed and this should be ready to merge. I updated the RDMA dependency (thanks for the tips) and also removed etc/cufile.json per our offline discussion.

You can see the CI outputs on my fork, which has Azure CI enabled: bdice#4