GEODE-4066: Add security manager integration test

[dgkimura]

Integration test passed on Mac and Windows

[jake-at-work]

Why not just replace the existing security tests with the configuration for security manager on the server? The old security model has been deprecated for some time. We are testing the security module on the server but rather the protocol between client and server which didn’t change: no point in validating the protocol for both server side modules.

[dgkimura]

@pivotal-jbarrett I updated this pull-request to instead update existing security test testThinClientSecurityMultiUserTest.

While doing that I noticed another bug related to GEODE-3645 where stale cache is dereferenced. Testcase exposed some awkward code where we chained dereferences of cacheimpl to cache to cacheimpl. The change "GEODE-3645: Fix stale cache references" addresses this problem. If it helps readability/history I can move it to a separate pull-request.

[jake-at-work]

@dgkimura Looks good, let's merge.