ipaclient: remove hard dependency on ipaplatform

Hard-code the user cache directory path in ipaclient.remote_plugins.schema.

https://fedorahosted.org/freeipa/ticket/6474

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipaplatform/base/paths.py

@@ -21,8 +21,6 @@
 This base platform module exports default filesystem paths.
 '''
 
-import os
-
 
 class BasePathNamespace(object):
     BASH = "/bin/bash"
@@ -350,17 +348,4 @@ class BasePathNamespace(object):
     IPA_GETKEYTAB = '/usr/sbin/ipa-getkeytab'
     EXTERNAL_SCHEMA_DIR = '/usr/share/ipa/schema.d'
 
-    @property
-    def USER_CACHE_PATH(self):
-        return (
-            os.environ.get('XDG_CACHE_HOME') or
-            os.path.join(
-                os.environ.get(
-                    'HOME',
-                    os.path.expanduser('~')
-                ),
-                '.cache'
-            )
-        )
-
 path_namespace = BasePathNamespace