Remove copy-schema-to-ca.py from master branch

This script is used only for IPA <3.1, so it must be compatible with
ipa-3-0 branch, so it should be placed there

https://pagure.io/freeipa/issue/6540

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

ipaserver/install/cainstance.py

@@ -1290,11 +1290,9 @@ def replica_ca_install_check(config, promote):
     else:
         root_logger.critical(
             'The master CA directory server does not have necessary schema. '
-            'Please copy the following script to all CA masters and run it '
-            'on them: %s\n'
+            'Please run copy-schema-to-ca.py on all CA masters.\n'
             'If you are certain that this is a false positive, use '
-            '--skip-schema-check.',
-            os.path.join(paths.USR_SHARE_IPA_DIR, 'copy-schema-to-ca.py'))
+            '--skip-schema-check.')
         exit('IPA schema missing on master CA directory server')