Bump warden

$ git shortlog bf943512..2113fe70
Anfernee Gui (4):
      fcntl_set_cloexec should respect on flag
      Stop script should kill all processes except wshd
      Merge "Stop script should kill all processes except wshd"
      Support customizing rootfs at create time

Kowshik Prakasam (5):
      Partial snapshotting after spawn/net_in requests.
      Merge "Partial snapshotting after spawn/net_in requests."
      Add health server config.
      Add health check http endpoint.
      Merge changes Ib11a4cd4,I2f793128

Pieter Noordhuis (4):
      Simplify pid to fd mapping code
      Configure both ends of a pump to be blocking
      Apply SNAT only for traffic coming from containers
      Merge "Apply SNAT only for traffic coming from containers"

Tang Rui (1):
      Don't masquerade traffic to loopback device

Change-Id: Idff90c1697bdbbc0fe70f5d71d687cad851a7c0a