Remove nova-cert leftovers

Right now, we can't build Nova package in RDO because the tooling still
find some bits for nova-cert in Nova codebase.
This patch aims to purge them:

- man entry for nova-cert
- nova-cert binary in setup.cfg

Change-Id: Iebee0fbcdad5808e6543e3bcad10ea1f08b8f306

doc/source/conf.py

@@ -123,8 +123,6 @@ man_pages = [
      [u'OpenStack'], 1),
     ('man/nova-cells', 'nova-cells', u'Cloud controller fabric',
      [u'OpenStack'], 1),
-    ('man/nova-cert', 'nova-cert', u'Cloud controller fabric',
-     [u'OpenStack'], 1),
     ('man/nova-compute', 'nova-compute', u'Cloud controller fabric',
      [u'OpenStack'], 1),
     ('man/nova-console', 'nova-console', u'Cloud controller fabric',

setup.cfg

@@ -49,7 +49,6 @@ console_scripts =
     nova-api-metadata = nova.cmd.api_metadata:main
     nova-api-os-compute = nova.cmd.api_os_compute:main
     nova-cells = nova.cmd.cells:main
-    nova-cert = nova.cmd.cert:main
     nova-compute = nova.cmd.compute:main
     nova-conductor = nova.cmd.conductor:main
     nova-console = nova.cmd.console:main