get_binary_name should returns strings without spaces

[Cedric Brandily]

get_binary_name() generates a string from sys.argv[0] which could contains spaces:
 * python -m unittest whatever implies sys.argv[0] = "python -m unittest" and get_binary_name == 'python -m unitte'

But iptables does not support spaces in chain name ... and get_binary_name() is used as prefix in chain name by iptables_manager
 * python -m unittest whatever implies incorrect iptables chain definition: iptables -N python -m unittest.

It typically brakes functional tests runned using python -m unittest $class.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/143108

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/143108
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=0937dca14b1f60bdf3d4377ee305d41a1721f153
Submitter: Jenkins
Branch: master

commit 0937dca14b1f60bdf3d4377ee305d41a1721f153
Author: Cedric Brandily <email address hidden>
Date: Fri Dec 19 15:05:53 2014 +0100

    get_binary_name should returns strings without spaces

    Iptables does not support chain names with spaces. It implies
    get_binary_name should return strings without spaces (they are used as
    chain name prefix). But currently 'python -m unittest $module' implies
    spaces in get_binary_name() result, it disallows to use it when $module
    is a functional test module. This change replaces spaces with
    underscores in get_binary_name results.

    Change-Id: Ie7c8518b92be46a4eea4e9345713fdeba844126d
    Closes-Bug: #1404250