Reduce default server selection timeout for tests

This should avoid hanging test builds if mongod fails to start.

Author: jmikola

phpunit.xml.dist

@@ -16,7 +16,7 @@
 
     <php>
         <ini name="error_reporting" value="-1"/>
-        <env name="MONGODB_URI" value="mongodb://127.0.0.1:27017"/>
+        <env name="MONGODB_URI" value="mongodb://127.0.0.1:27017/?serverSelectionTimeoutMS=100"/>
         <env name="MONGODB_DATABASE" value="phplib_test"/>
     </php>