tests: Convert to using `neighbor X timers connect 1` for exabgp using tests

tests: Convert to using `neighbor X timers connect 1` for exabgp using tests

For those tests using exabgp convert them all to use `neighbor X timers
connect 1`.  I have noticed that occassionally when looking at the
support files for tests run that peers are in a wait period for
reconnecting which is longer than the test is waiting to converge.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>