Traceback when over allocating IP addresses
Traceback when over allocating IP addresses

When a user over allocates a number of IP addresses
via euca-allocate-address, the user will get a nice
traceback saying that they over quota for IP address
allocation. Display a more userfriendly error when this
happens.

LP: #971609

Change-Id: If8586e246564f1069cb60bac9592f9d750522e81
Signed-off-by: Chuck Short <753a8074f04ffd62a8fff7516e3ae689be8e35ad@canonical.com>

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