Description of problem:
Here is a small testcase connecting to AMT via HTTP

1) Not working
#!/usr/bin/python
import pywsman

client = pywsman.Client('192.0.2.99', 16992, '/wsman', 'http', 'admin', 'foo')
options = pywsman.ClientOptions()
doc = client.identify(options)
print(doc.root())

$ ./minimal.py
Traceback (most recent call last):
  File "./minimal.py", line 8, in <module>
    print(doc.root())
AttributeError: 'NoneType' object has no attribute 'root'

2) Working
#!/usr/bin/python
import pywsman

client = pywsman.Client('192.0.2.99', 16992, '/wsman', 'http', 'admin', 'foo')
client.transport().set_verify_host(False)
options = pywsman.ClientOptions()
doc = client.identify(options)
print(doc.root())

$ ./minimal.py
http://schemas.dmtf.org/wbem/wsman/1/wsman.xsdIntel(r)AMT 8.11.0.0.....


Version-Release number of selected component (if applicable):
libwsman1-2.3.6-13.el7.x86_64
openwsman-python-2.3.6-13.el7.x86_64


Additional info:
I raise this bug, only because this seems to be fixed in a later version.
If I take rpms from here http://download.opensuse.org/repositories/Openwsman/CentOS_CentOS-7/x86_64/ and install the following:
libwsman3-2.6.2-170.3        
openwsman-python-2.6.2-170.3 
wsmancli-2.6.0-56.13         

I observe that the test works without needing the set_verify_host(False) call:
$ more minimal.py 
#!/usr/bin/python
import pywsman

client = pywsman.Client('192.0.2.99', 16992, '/wsman', 'http', 'admin', 'foo')
#client.transport().set_verify_host(False)
options = pywsman.ClientOptions()
doc = client.identify(options)
print(doc.root())
[stack@undercloud ~]$ ./minimal.py 
http://schemas.dmtf.org/wbem/wsman/1/wsman.xsdIntel(r)AMT 8.11.0.0....


I will see which specific commit that fixes this, later on. I need this to get
ironic working with AMT boxes