uuidd: remove timeout from systemd service file

It seems that SAP does not like the timeout, for performance is
better to keep the daemon permanently running. This is no problem
because uuidd is used only on systems with very unusual requirements
to UUID.

Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1092039
Signed-off-by: Karel Zak <kzak@redhat.com>