Depending on your use case, ec2_eip is not idempotent.  I would like to 
attach a new EIP to an instance *iff* the instance doesn't already have an 
EIP attached.

Currently, the module operates in two modes:

   1. if you don't specify an existing EIP address, the module will attach 
   a new arbitrary EIP regardless of whether the instance already has one 
   attached (not idempotent).
   2. if you do specify an existing EIP address, then the module will 
   attach that EIP *iff* the EIP is not attached to any instance.
   
It seems like case (1) should be idempotent and assume that an instance 
with an already-attached EIP requires no change.

Thoughts?

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