This patch adds a sysrestore module which allows ipa-server-install
code to backup any system state so that it can be restored again
with e.g. ipa-server-install --uninstall.
The idea is that any files ipa-server-install modifies gets backed
up to /var/cache/ipa/sysrestore/ while any "meta" state, like
whether a service is enabled with chkconfig, is saved to
/var/cache/ipa/sysrestore.state.
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
