Do not verify SSL certificates for local connections

1) modifies several pyVim.connect methods to silently disable
SSL verification when connecting to localhost, and
2) adds a small patch to site.py to make it easier to test
this configuration by not throwing away the one good SSL
configuration. I use this patch below to test my change.

Testing Done:
$ python
>>> import ssl
>>> ssl._create_default_https_context = ssl._create_verified_context
>>> from pyVim.connect import SmartConnect
>>> s = SmartConnect() # default host='localhost', no error
>>> s = SmartConnect(host='localhost') # no error
>>> s = SmartConnect(host='127.0.0.1') # no error
>>> s = SmartConnect(host='kevinc-esx.eng.vmware.com')
Traceback (most recent call last):
...
ssl.CertificateError: hostname 'kevinc-esx.eng.vmware.com' doesn't match 'localhost.localdomain'

pyVim/connect.py

@@ -53,6 +53,19 @@ Global (thread-shared) ServiceInstance
 @todo: Get rid of me?
 """
 
+
+def localSslFixup(host, sslContext):
+    """
+    Connections to 'localhost' do not need SSL verification as a certificate
+    will never match. The OS provides security by only allowing root to bind
+    to low-numbered ports.
+    """
+    if not sslContext and host in ['localhost', '127.0.0.1', '::1']:
+        import ssl
+        if hasattr(ssl, '_create_unverified_context'):
+            sslContext = ssl._create_unverified_context()
+    return sslContext
+
 class closing(object):
    """
    Helper class for using closable objects in a 'with' statement,
@@ -235,6 +248,8 @@ def Connect(host='localhost', port=443, user='root', pwd='',
    except ValueError as ve:
       pass
 
+   sslContext = localSslFixup(host, sslContext)
+
    if namespace:
       assert(version is None)
       version = versionMap[namespace]
@@ -690,6 +705,8 @@ def SmartStubAdapter(host='localhost', port=443, path='/sdk',
    if preferredApiVersions is None:
       preferredApiVersions = GetServiceVersions('vim25')
 
+   sslContext = localSslFixup(host, sslContext)
+
    supportedVersion = __FindSupportedVersion('https' if port > 0 else 'http',
                                              host,
                                              port,
@@ -759,6 +776,8 @@ def SmartConnect(protocol='https', host='localhost', port=443, user='root', pwd=
    if preferredApiVersions is None:
       preferredApiVersions = GetServiceVersions('vim25')
 
+   sslContext = localSslFixup(host, sslContext)
+
    supportedVersion = __FindSupportedVersion(protocol,
                                              host,
                                              port,