rhbz#1121254 reload font list from shell on change

Change-Id: Ief88373c210b3b6f65c1df5b31870aca561095bb
(cherry picked from commit 0497864bd4f603605997938d504ef9598623e713)
Reviewed-on: https://gerrit.libreoffice.org/10546
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>