Fix Memcached::(inc|dec)rement(ByKey)? when ASCII protocol is used

Summary: We weren't correctly dispatching to the right memcached_* function,
causing it to always fail when using the ascii protocol. There's still one
divergence from PHP5: if an initial_value is given but the connection is using
the acsii protocol, PHP will raise a warning and return false, but we'll
silently ignore the initial value and continue on with the increment. Details
are in the comment.

Closes https://github.com/facebook/hhvm/issues/3839

Reviewed By: @ptarjan

Differential Revision: D1579907
Stop returning systemlib data in Reflection

Summary: I removed a slow test, because I copied it and added more function to test on.

Fixes #3852
Closes https://github.com/facebook/hhvm/pull/3857

Reviewed By: @ptarjan

Differential Revision: D1580841