The install recipe now calls other recipes directly instead of calling default

The sentinel recipe had been causing the configure recipe to fire. This was a
problem as it would configure a default redis instance when you probably didn't
want it to.  You would end up with sentinel installed and running but config
cruft left over that shouldn't have been there.  This solves that problem!
Updates the vagrant file to add a sentinel vagrant machine.

The Vagrant file now has a sentinel instance added as well which can monitor
the redisio instance.  This is very useful for testing and other purposes.