do not enable dci-extras
do not enable dci-extras

If we enable dci-extras, a new version of setuptools is pulled.
The /usr/bin/dci-agent built by this new version won't be able with
the regular setuptools from EL7. We will end up with this error:

  -bash-4.2$ dci-agent
  Traceback (most recent call last):
    File "/bin/dci-agent", line 5, in <module>
      from pkg_resources import load_entry_point
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 3007, in <module>
      working_set.require(__requires__)
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 728, in require
      needed = self.resolve(parse_requirements(requirements))
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 601, in resolve
      requirements = list(requirements)[::-1]  # set up the stack
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2839, in parse_requirements
      line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2807, in scan_list
      raise ValueError("Expected "+item_name+" in",line,"at",line[p:])

This commit also ensure with use GPG with the centos-openstack-mitaka repository.

Change-Id: I27a80f06e209e5b68c7197b9a525dce562916bc2

redhat-cip/dci-agent