scenario_test: Extend Graceful Restart time

The current Graceful Restart time is 20 sec, but this value is not
enough long and can be exceeded unexpectedly while waiting for
re-establishing peer connections. Then the stale paths on a receiving
router are dropped before the paths successfully synced, and some test
cases on "graceful_restart_test.py" will be passed unexpectedly.

This patch extends the Graceful Restart time to 30 sec and introduces
the constants for Graceful Restart time and Long-Lived Graceful Restart
time.

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>

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