Description of problem:
When configure "encrypted_password" with wrong value, start virt-who will show "UnicodeDecodeError: 'ascii' codec can't decode byte 0xdf in position 15: ordinal not in range(128)" in rhsm.log

Version-Release number of selected component (if applicable):
virt-who-0.17-10.el7.noarch
subscription-manager-1.17.10-1.el7.x86_64
python-rhsm-1.17.6-1.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Generate encrypted password with virt-who-password.
[root@hp-z220-04 virt-who.d]# virt-who-password 
Password: 
Use following as value for encrypted_password key in the configuration file:
bc49696be3ac62ce89defe9fd80f5d33

2. Run virt-who with wrong "encrypted_password" in /etc/virt-who.d/XX
[root@hp-z220-04 virt-who.d]# cat /etc/virt-who.d/rhevm 
[test-rhevm1]
type=rhevm
server=https://tyan-gt24-04.rhts.eng.bos.redhat.com:443/ovirt-engine/
username=admin@internal
encrypted_password=43f282d679adb816f2bb1cf9c18949ec
owner=ACME_Corporation
env=Library
sat_server=10.73.3.209
sat_username=admin
sat_password=redhat

3. Restart virt-who service and check virt-who's log
[root@hp-z220-04 virt-who.d]# service virt-who restart&&tail -f /var/log/rhsm/rhs.log
2016-08-31 22:33:04,610 [virtwho.test-rhevm1 ERROR] RhevM-1(14996):MainThread @virt.py:run:379 - Virt backend 'test-rhevm1' fails with exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 372, in run
    self._run()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 409, in _run
    report = self._get_report()
  File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 334, in _get_report
    return HostGuestAssociationReport(self.config, self.getHostGuestMapping())
  File "/usr/lib/python2.7/site-packages/virtwho/virt/rhevm/rhevm.py", line 116, in getHostGuestMapping
    clusters_xml = self.get_xml(self.clusters_url)
  File "/usr/lib/python2.7/site-packages/virtwho/virt/rhevm/rhevm.py", line 96, in get_xml
    response = self.get(url)
  File "/usr/lib/python2.7/site-packages/virtwho/virt/rhevm/rhevm.py", line 85, in get
    response = requests.get(url, auth=self.auth, verify=False)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 68, in get
    return request('get', url, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 50, in request
    response = session.request(method=method, url=url, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 450, in request
    prep = self.prepare_request(req)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 381, in prepare_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "/usr/lib/python2.7/site-packages/requests/models.py", line 308, in prepare
    self.prepare_auth(auth, url)
  File "/usr/lib/python2.7/site-packages/requests/models.py", line 495, in prepare_auth
    r = auth(self)
  File "/usr/lib/python2.7/site-packages/requests/auth.py", line 50, in __call__
    r.headers['Authorization'] = _basic_auth_str(self.username, self.password)
  File "/usr/lib/python2.7/site-packages/requests/auth.py", line 30, in _basic_auth_str
    b64encode(('%s:%s' % (username, password)).encode('latin1')).strip()
UnicodeDecodeError: 'ascii' codec can't decode byte 0xdf in position 15: ordinal not in range(128)


Actual results:
It will show "UnicodeDecodeError: 'ascii' codec can't decode byte 0xdf in position 15: ordinal not in range(128)" in the log.

Expected results:
It should show "2016-08-31 22:45:50,738 [virtwho.test-rhevm1 ERROR] RhevM-1(10066):MainThread @virt.py:run:375 - Virt backend 'test-rhevm1' fails with error: Unable to connect to RHEV-M server: 401 Client Error: Unauthorized
"

Additional info:
It hasn't the problem on satellite6.2.1