Run all the hooks on all the instances.
Run all the hooks on all the instances.

migrate, symlink, and restart each have before/after hooks. This way,
customers don't have to know e.g. that the hook that runs after
symlinking is called 'before_restart'.

This brings the total number of available hooks to 6.

[#65 state:merged]

Change-Id: Ib45af855cad92a00c5732118d06f83558cf3e9fe
Reviewed-on: http://review.engineyard.com/273
Reviewed-by: Andy Delcambre <dceae9ae498de7d794de551710d5e4d9b952cadb@engineyard.com>
Tested-by: Andy Delcambre <dceae9ae498de7d794de551710d5e4d9b952cadb@engineyard.com>

engineyard/engineyard-serverside,engineyard/engineyard-serverside,engineyard/engineyard-serverside,engineyard/engineyard-serverside