PHPC-1539: Use mongoc error types over generic int
PHPC-1539: Use mongoc error types over generic int

jmikola/mongo-php-driver,mongodb-labs/mongo-php-driver-prototype,jmikola/mongo-php-driver-prototype,mongodb-labs/mongo-php-driver-prototype,mongodb-labs/mongo-php-driver-prototype,jmikola/mongo-php-driver-prototype,mongodb/mongo-php-driver,jmikola/mongo-php-driver-prototype,mongodb-labs/mongo-php-driver-prototype,mongodb/mongo-php-driver,jmikola/mongo-php-driver-prototype,mongodb-labs/mongo-php-driver-prototype,jmikola/mongo-php-driver,jmikola/mongo-php-driver,mongodb/mongo-php-driver,jmikola/mongo-php-driver,jmikola/mongo-php-driver-prototype,mongodb/mongo-php-driver,mongodb/mongo-php-driver,jmikola/mongo-php-driver