Add junit formatter to the elixir tests

[garrensmith]

Overview

Adds the junit formatter for the elixir tests so that Jenkins can read the test output nicely

Testing recommendations

run mix test and then look under _build/test/lib/foo/test-junit-report.xml for the xml output

Checklist

• Code is written and works correctly;
• Changes are covered by tests;
• Documentation reflects the changes;

[eiri]

The check formatter (mix 1.8.0) fails on test_helper.exs changes, insist on config to look like

@@ -1,3 +1,7 @@
-ExUnit.configure(exclude: [pending: true], formatters: [JUnitFormatter, ExUnit.CLIFormatter])
+ExUnit.configure(
+  exclude: [pending: true],
+  formatters: [JUnitFormatter, ExUnit.CLIFormatter]
+)
+

Credo fails with [R] ↗ Variable names should be written in snake_case. for lib/couch.ex:58:5 #(Couch.process_url), sorry no idea how to fix this, so can't actually run the tests.

[wohali]

@garrensmith This might be something we want to piece into the top-level Jenkinsfile, not sure.

[garrensmith]

Yes. I think it would work perfectly there

…

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