ipatests: Run restoring backup files and restoring their context in one session
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>