github58: cleaning up setup_cluster.py
removed unnecessary clean_up.py
github58: break out of loop when process found in kill_mongo_proc
github58: new setup and teardown methods for sharding tests
github58: some minor fixes
github58: test_retrieve_doc, test_get_oplog_cursor
github58: test_get_last_oplog_timestamp, test_dump_collection, test_init_cursor
github58: removed lone wanderin' return statement
github58: test_rollback
also fixes for rollback method to accomodate > 1 rollback simultaneously
very minor comment and style changes
github58: cleanup of sharded oplog thread tests
github58: better retry_until_ok
github58: test_with_chunk_migration
minor syntax improvement
assert balancer running
assert_soon added to testing utils
using assert_soon in all tests
fixed test_with_chunk_migration
started commit_with_orphan_documents
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