reduce number of nodes for tests to 1 node

[adammoody]

No description provided.

[adammoody]

This one will take a bit more effort, because it uses hostname to define failure groups. This will need to be changed to some string that encodes a rank id or something instead.

[gonsie]

which tests require more than 1 node? everything but single?

It looks like test_reset has 4 tests:

single
partner
xor
rs
We could put a simple MPI check before running the multi-node test. an all reduce (maybe comm split?) on the hostname. If we don't have multiple nodes we shouldn't run the tests.

alternatively, we could maybe put a toggle in to say whether we expect the test to pass or fail?

[adammoody]

My hope is that we can rewrite the test program so that all of the tests can run on a single node, but we have some work to do to accomplish that, if it's possible. Until then, we can just keep things simple and assume that all tests require multiple nodes (even if a few don't).