tests: give "-plaintextnames" its own test package

...and add tests for checking that gocryptfs.diriv
does not get created.

The main "integration_tests" package has become quite
big and convoluted over time.

This small separate package should make writing tests
for "-plaintextnames" easier.

As seen in "fusefrontend: fix PlaintextNames versions of Mkdir, Rmdir",
we need more of them.

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