inside ec2ops.py under associate and disassociate fix the code

Make sure we associate an ip and wait properly before saying ip address is 'associated' and same for disassociate, when done with disassociate we make sure its disassociated before saying ip address is 'disassociated'

consider this as temporary fix to ensure instancetest.py works , which is one of the best test case so far used by everyone , more involved fix will come later , with a cleaner implementation of wait_address() as discussed on IRC