Fix test_webui.test_selinuxusermap

A previous refactoring of SELinux tests has have a wrong
assumption about the user field separator within
ipaSELinuxUserMapOrder. That was '$$', but should be just '$'.

Actually, '.ldif' and '.update' files are passed through
Python template string substitution:

> $$ is an escape; it is replaced with a single $.
> $identifier names a substitution placeholder matching
> a mapping key of "identifier"

This means that the text to be substituted on should not be escaped.
The wrong ipaSELinuxUserMapOrder previously set will be replaced on
upgrade.

Fixes: https://pagure.io/freeipa/issue/7996
Fixes: https://pagure.io/freeipa/issue/8005
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>

ipaserver/install/ldapupdate.py

@@ -322,6 +322,9 @@ class LDAPUpdate:
         if not self.sub_dict.get("SELINUX_USERMAP_DEFAULT"):
             self.sub_dict["SELINUX_USERMAP_DEFAULT"] = \
                 platformconstants.SELINUX_USERMAP_DEFAULT
+        if not self.sub_dict.get("SELINUX_USERMAP_ORDER"):
+            self.sub_dict["SELINUX_USERMAP_ORDER"] = \
+                platformconstants.SELINUX_USERMAP_ORDER
         self.api = create_api(mode=None)
         self.api.bootstrap(in_server=True,
                            context='updates',