Restoring backup files and restoring their context were two separate commands,
what means that in case we use SSHTrasport, which creates a separate SSH
session for each command, we try to restore the SELinux context of the
changed files in a new session.
This causes problems, if the access to files themselves are necessary
for the creation of the new SSH session.
https://fedorahosted.org/freeipa/ticket/4133
Reviewed-By: Petr Viktorin <pviktori@redhat.com>