Fixed Exception in DoublyLinkedList::offsetUnset

Summary: zendtests are hopefully enough test coverage
Closes https://github.com/facebook/hhvm/pull/3391

Reviewed By: @fredemmott

Differential Revision: D1484805

Pulled By: svcscm
Fix an argument ordering bug in Redis lrem.

Summary: The PHP interface takes arguments in a different order than the redis server expects them.
Interchange (0-based) args 1 and 2 keyed off of the command name.

This fixes https://github.com/facebook/hhvm/issues/3357

A scan through the Redis PHP API documentation leads me to believe this is the only
instance wherein the PHP arguments are in a different order than the server arguments.
Closes https://github.com/facebook/hhvm/pull/3358

Reviewed By: @LiraNuna

Differential Revision: D1476999

Pulled By: svcscm
Use standard http reason for replay server

Summary: Closes https://github.com/facebook/hhvm/pull/3387

Reviewed By: @ptarjan

Differential Revision: D1484823

Pulled By: svcscm