Extend maxprefix and maxprefixout tests to also check that the limits
are checked during reload.

bgpd no longer immediatly opens the connection to its peers so instead
use 'bgpctl nei RDOMAIN2 up' to force the connection up. While there
use the same timeouts everywhere. May need further tuning b

bgpd no longer immediatly opens the connection to its peers so instead
use 'bgpctl nei RDOMAIN2 up' to force the connection up. While there
use the same timeouts everywhere. May need further tuning but this
works for me.
Issue noticed by anton@

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Add a sleep when starting the bgpd daemons so that there is less chance
for a connection collision.

Add a simple regress test to check that max-prefix works