Comment 10 for bug 1514457

Reviewed: https://review.openstack.org/243159
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=bdf1d8d11fe57074214d639715eb229a83b52325
Submitter: Jenkins
Branch: master

commit bdf1d8d11fe57074214d639715eb229a83b52325
Author: Guillaume Chenuet <email address hidden>
Date: Mon Nov 9 16:10:48 2015 +0100

    Fixing test_create_port_in_allowed_allocation_pool when 3 (or more) controllers

    When running Tempest test test_create_port_in_allowed_allocation_pools
    on a 3 controllers infra, we have this error: No more IP addresses available
    on network UUID.

    In the code, the function created a new subnet with only 3 IPs available for
    the allocation pools.

    One is used for the network, another for neutron s port and the last one for
    the broadcast.

    A better way could be to used and concate default parameters
    tenant_network_subnet and tenant_network_mask_bits and check if the subnet
    is large enough.

    Changed way to calculate allocation_pool:

    * Used and concate tenant_network_subnet & tenant_network_mask_bits
    * Check if the mask bits is not too small for the test
    * If it is OK, create net, subnet and try to allocate a port

    Change-Id: Id523c54037518ea199cd88d553b4cdfef59a186b
    Closes-Bug: 1514457