PHPLIB-454: Remove test dependence on startAtOperationTime
PHPLIB-454: Remove test dependence on startAtOperationTime

jmikola/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library-prototype,mongodb/mongo-php-library,mongodb/mongo-php-library,mongodb/mongo-php-library,10gen-labs/mongo-php-library-prototype,mongodb/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library