tests: Update OSPF TE topotests

tests: Update OSPF TE topotests

The OSPF TE topotest is using switches to interconnect router. During the test,
interfaces are shutdown on some routers to simulate link failure and check that
the TED is correctly updated. However, the switche between router avoid the
detection by the neighbor router that the interface is down i.e. the interface
line remains up as it is conneted to the switch and not to the router.

This patch update the tested topology by removing the switch and connect
directly the router excepted the inter AS link on R3. Interface are also
renamed accordingly.

Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>
(cherry picked from commit 55ad78575351fa90a2485b99b3665adb74712c65)