Is there a way to force all jabber clients to sign out so that a new jabber-config file can be pulled from the CM?
One option you can use is Bulk un-license all the users from CUCM, for presence and license it back. Please try it for one single user and check if you obtain the desired results, i haven't tested it but if it logs the users out next time when user logs in jabber will automatically download the new jabber-config.xml file
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There is no such way of forcing the jabber to logout, but you could try restarting XCP router service which will make the jabber to go offline and can be restored when user logsout and login back. This will kind of make users to logout and login back.