Tpetra: No unit test for "4-arg" variant of Distributor::doPosts "slow path"

[tasmith4]

Enhancement

@trilinos/tpetra

The "4-arg" (varying number of packets per LID) variant of Distributor's doPosts operation does not have a unit test covering the "slow path" case (when the data is not contiguous by processor in the input "exports" array). There is a "doPostsNonContig" test for the "3-arg" (constant number of packets per LID) variant, which could possibly be used as a basis with some modification.

This is probably not urgent, as the code path is highly likely to be tested indirectly by other Tpetra unit tests (perhaps CrsMatrix?). However, it would aid in localizing errors to have this test.

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