ipatests: Allow change_principal context manager to use canonicalization

The context manager has been extended to optionally request principal
canonicalization and indicate that the enterprise principal is being
used.

This allows to change the user during the test to an user using the alias
and to test behavior related to enterprise principals.

https://fedorahosted.org/freeipa/ticket/6142

Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>

ipatests/util.py

@@ -693,7 +693,8 @@ def unlock_principal_password(user, oldpw, newpw):
 
 
 @contextmanager
-def change_principal(user, password, client=None, path=None):
+def change_principal(user, password, client=None, path=None,
+                     canonicalize=False, enterprise=False):
 
     if path:
         ccache_name = path
@@ -708,7 +709,8 @@ def change_principal(user, password, client=None, path=None):
 
     try:
         with private_ccache(ccache_name):
-            kinit_password(user, password, ccache_name)
+            kinit_password(user, password, ccache_name,
+                           canonicalize=canonicalize, enterprise=enterprise)
             client.Backend.rpcclient.connect()
 
             try: