Description of problem:

Using the standard python httplib on RHEL 7 (as opposed to using m2crypto on RHEL 6), results in failure to appropriately detect proxy authentication failure.

Presently we are detecting proxy authentication failure by looking at the error message contained within a socket.error exception (not ideal). httplib.PROXY_AUTHENTICATION_REQUIRED is the string "407".

"""
        except socket.error as err:
            if str(err)[-3:] == str(httplib.PROXY_AUTHENTICATION_REQUIRED):
                raise ProxyException(err)
            raise
"""

The problem with this is that on RHEL 6 the socket.error message for proxy authentication failure is:

"""
Proxy connection failed: 407
"""

And On RHEL 7 the exception message is:

"""
Tunnel connection failed: 407 Proxy Authentication Required
"""

Regardless of the exact messaging that we choose to display to the end user, we should ensure that proxy authentication failures are handled the same way.


Version-Release number of selected component (if applicable):
subscription-manager-1.20.10-3.el6 (or subscription-manager-1.20.10-1.el7)

How reproducible:
100%

Steps to Reproduce:
1. Modify /etc/rhsm/rhsm.conf to use a proxy

"""
... snip ...
proxy_hostname= auto-services.usersys.redhat.com
proxy_port= 3128
proxy_user=
proxy_password=
... snip ...
"""

2. Run almost any subman cli command (for example):
   On RHEL 6:
   """
   [root@jsefler-rhel6 ~]# subscription-manager orgs --user testuser1 --password redhat                   
   Proxy error, unable to connect to proxy server.
   """
   
   On RHEL7:
   """
   [root@jsefler-rhel7 ~]# subscription-manager orgs --user testuser1 --password redhat
   Network error, unable to connect to server. Please see /var/log/rhsm/rhsm.log for more information.
   """


Actual results:
See "On RHEL7" above

Expected results:
Should match RHEL 6