Convert NCR test to SystemTestsCompareTwo infrastructure

[billsacks]

We want to convert the various system tests that compare two runs to use the SystemTestsCompareTwo infrastructure, where possible. I am opening separate issues for each such system test, so that we can check them off as we do this conversion.

[jgfouca]

Assigning @mfdeakin-sandia since he's done some of these in the past.

[rljacob]

Should probably give this to someone else since Michael is committed to critical path team tasks.

[mfdeakin-sandia]

I think I have some time coming up; they didn't mention any new SE things in the meeting yesterday.
Though I'd probably focus on the other issues assigned to me first

[rljacob]

ok.

[billsacks]

I stumbled across what I think is a bug in the current NCR: I think that

restore("env_build.NCR2.xml", "env_build.xml")

should be

restore("env_build.NCR2.xml", newname="env_build.xml")

[mvertens]

@billsacks - I added this fix in PR #1638.