[api-ref] Remove temporary block in conf.py
[api-ref] Remove temporary block in conf.py

The os-api-ref 1.0.0 is out. We can remove the support to older version now.
Reference:
https://github.com/openstack/senlin/commit/6d41feb58dd836d426c9b6f025846dbbf7295097

Change-Id: I0b28cd3f6b5c393d63b9ab2b4dcd3b7b3c20f9b4

hurricanerix/swift,nadeemsyed/swift,redbo/swift,openstack/swift,notmyname/swift,smerritt/swift,clayg/swift,swiftstack/swift,smerritt/swift,tipabu/swift,swiftstack/swift,clayg/swift,nadeemsyed/swift,tipabu/swift,openstack/swift,hurricanerix/swift,psachin/swift,matthewoliver/swift,matthewoliver/swift,notmyname/swift,psachin/swift,redbo/swift,psachin/swift,tipabu/swift,openstack/swift,notmyname/swift,hurricanerix/swift,notmyname/swift,matthewoliver/swift,smerritt/swift,swiftstack/swift,psachin/swift,tipabu/swift,smerritt/swift,openstack/swift,hurricanerix/swift,clayg/swift,nadeemsyed/swift,nadeemsyed/swift,clayg/swift,matthewoliver/swift