SERVER-8487 Fix broken condition in oplog reader code.
Skip jstests/sharding/read_pref.js when running test with auth SERVER-6972 SERVER-4237
SERVER-8344 Prevent query state errors on index rebuild
SERVER-939 abilitiy to distribute collections in a single db

Port tests from d_chunk_manager_tests.cpp for collection_manager_test.cpp
remove flaky timing test