do away with PROTOCOL_SSLv3

[ToniMueller]

In Debian Testing, Python 2.7 does no longer include the symbols PROTOCOL_SSLv2 and PROTOCOL_SSLv3. The attached patch fixes this against Nova trunk.

Unrelated: The following command, run from /opt/stack in a devstack environment, did not yield any call to the function validate_ssl_version(), which is the only user of the affected data structure:

find . -name '*.py' -type f |xargs grep -nF validate_ssl_version

The nova version, according to the PKG-INFO file, is 2015.1.dev70.

[Davanum Srinivas (DIMS) (dims-v)]

@ToniMueller, we need to fix the code in oslo-incubator first. you are right a quick scan does not show any users of
validate_ssl_version so we need to remove the entire _SSL_PROTOCOLS variable and references from sslutils in oslo-incubator first and then cleanup the copy in nova.

[Davanum Srinivas (DIMS) (dims-v)]

Fixed in oslo-incubator - Change-Id: I0d1d52bd9558a21af2d6bd439884cba26fafcc8b
Also fixed in nova - Change-Id: Id1d7250b5cff142d54004f604e6c2ae04709958b

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/166305

[OpenStack Infra (hudson-openstack)]

Change abandoned by Ian Cordasco (<email address hidden>) on branch: stable/juno
Review: https://review.openstack.org/166305