[PATCH 0 of 2] libxl: AO support in domain suspend ops

[Shriram Rajagopalan <rshriram@cs.ubc.ca>]

Make libxl's suspend callback be asynchronous and refactor the code
accordingly.  Ian J's patch on introducing the async suspend stub
functions has been merged into patch 2.

[1/2] Add an asynchronous version of the common suspend core
      (libxl__domain_suspend_common_callback), while retaining
      the existing synchronous version.  Add a callout to Remus
      (libxl__domain_suspend_callback_remus) that gets called post
      domain suspend.  Remus specific post-suspend tasks are
      implemented here.

[2/2] Remove the synchronous version of libxl__domain_suspend_common_callback.
      Also remove the separate entry point for Remus (libxl__remus_domain_suspend_callback).
      Instead, introduce a common entry point (libxl__domain_suspend_callback).

N.B. This series depends on the remus network buffering patch series.

thanks
shriram