Fix EUnit timeouts (#2087)

* Proactively increase timeout for PBKDF2 test

This test was taking 134s in a recent run, which is uncomfortably close
to the threshold.

* Extend timeouts for all reshard API tests

We're observing timeouts on various tests in this suite so let's keep
it consistent and increase timeouts across the board.

* Bump default timeout for all mem3_reshard tests

A couple of these tests were exceeding the default timeout under normal
circumstances, but many of them do a significant amount of work, so for
simplicity we set a module-wide timeout and apply it consistently
throughout.

* Modernize the sync_security test setup/teardown

This test actually doesn't do much real work, but I think what was
happening is that the setup and teardown time was being charged to the
test itself. I've refactored it to use a more modern scaffolding
following some of our more recent additions to the test suite, but have
left the timeout at the default to test this hypothesis.

* Increase timeouts on more heavyweight mem3 tests

* Extend timeouts for replication tests

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