Description of problem:

if you pass only a fqdn to --proxy-url as part of the installation, everything will go fine but syncing will be broken.  


Version-Release number of selected component (if applicable):
Satellite mdp2

How reproducible:
Always

Steps to Reproduce:
1.  Install katello and only specify an fqdn/hostname to --proxy-url
2.  import a manifest, enable a product & repo, and try to sync one

Actual results:
Failure

Expected results:
Should not be able to pass in just the fqdn/hostnanme to --proxy-url, it should require a proper protocol in the url. (i.e. http://hostname.com/)

Additional info:

Error in /var/log/pulp/nectar.log:
TypeError: sequence item 0: expected string, NoneType found
2013-11-20 20:30:50,497 nectar.downloaders.threaded:ERROR: Unhandled Exception in Worker Thread [140719895340800]
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/nectar/downloaders/threaded.py", line 93, in worker
    session = build_session(self.config)
  File "/usr/lib/python2.6/site-packages/nectar/downloaders/threaded.py", line 282, in build_session
    _add_proxy(session, config)
  File "/usr/lib/python2.6/site-packages/nectar/downloaders/threaded.py", line 312, in _add_proxy
    url = ':'.join((host, str(config.proxy_port)))