Mahout suite update

No jira for this. It clears a possible build failure but is primarily meant to automate tmp dir creation and deleting in scala tests. It adds a TmpDir name ("tmp/") and deletes it beforeAll tests in a suite then afterEach. It's in MahoutSuite. Work is done with java.io since it's only for scalatests and avoids importing libs or changing the pom.


It's been a long time since I used java.io. "Try" is bad form if you just drop them all so I added a check and got rid of all tries.