Description of problem:
When stop virt-who service,it will show ""Error in communication with subscription manager as BadStatusLine".

Version-Release number of selected component (if applicable):
virt-who-0.16-1.el6.noarch
subscription-manager-1.16.6-1.el6.x86_64
python-rhsm-1.16.4-1.el6.x86_64

How reproducible:
90%

Steps to Reproduce:
1. Register system to Satellite 
2. Configure virt-who run at libvirt mode and refresh interval is default.
3. Start virt-who service
[root@hp-z220-05 tmp]# service virt-who start
Starting virt-who: [  OK  ]
4. Stop virt-who service and check virt-who's log 
[root@hp-z220-05 tmp]# service virt-who stop
Stopping virt-who: [  OK  ]
[root@hp-z220-05 tmp]# ps -ef|grep virt-who
root     12326  9603  0 15:37 pts/0    00:00:00 grep virt-who
[root@hp-z220-05 tmp]# tail -f /var/log/rhsm/rhsm.log

Actual results:
Although virt-who was stop, virt-who will show communication error with subscription-manager in the log.
2015-12-23 15:37:11,114 [virtwho.main DEBUG] MainProcess(12294):MainThread @virtwho.py:terminate:413 - virt-who is shutting down
2015-12-23 15:37:12,119 [virtwho.main ERROR] MainProcess(12294):MainThread @virtwho.py:send:243 - Error in communication with subscription manager:
Traceback (most recent call last):
  File "/usr/share/virt-who/virtwho.py", line 222, in send
    self._sendGuestList(report)
  File "/usr/share/virt-who/virtwho.py", line 249, in _sendGuestList
    manager.sendVirtGuests(report.guests)
  File "/usr/share/virt-who/manager/subscriptionmanager/subscriptionmanager.py", line 140, in sendVirtGuests
    self.connection.updateConsumer(self.uuid(), guest_uuids=serialized_guests)
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 943, in updateConsumer
    params['guestIds'] = self.sanitizeGuestIds(guest_uuids)
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 987, in sanitizeGuestIds
    return [self.sanitizeGuestId(guestId) for guestId in guestIds or []]
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 993, in sanitizeGuestId
    if self.supports_resource('guestids'):
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 814, in supports_resource
    self._load_supported_resources()
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 801, in _load_supported_resources
    resources_list = self.conn.request_get("/")
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 654, in request_get
    return self._request("GET", method)
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 551, in _request
    response = conn.getresponse()
  File "/usr/lib64/python2.6/httplib.py", line 1012, in getresponse
    response.begin()
  File "/usr/lib64/python2.6/httplib.py", line 404, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python2.6/httplib.py", line 368, in _read_status
    raise BadStatusLine(line)
BadStatusLine
2015-12-23 15:37:12,123 [virtwho.main DEBUG] MainProcess(12294):MainThread @virtwho.py:<module>:890 - virt-who terminated 

Expected results:
It shouldn't show any error info in the log when stop virt-who service.

Additional info: