Split UpgradeCheck unit and integration tests

Within the context of the upgrade checker being unresponsive because of Shellshock patching, this PR moves the UpgradeCheckTest.testNoReponse test out of the common unit tests to the `OmeroJava` integration tests. This shoud have the immediate effect of restoring Travis and prevent every subsequent build from hitting the upgrade checker.

/cc @bpindelski 

--no-rebase