winsync-migrate: Move the tool under ipaserver.install package

https://fedorahosted.org/freeipa/ticket/4524

Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>

install/tools/ipa-winsync-migrate

@@ -18,6 +18,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-from ipaserver.winsync_migrate.base import WinsyncMigrate
+from ipaserver.install.ipa_winsync_migrate import WinsyncMigrate
 
 WinsyncMigrate.run_cli()