test/lib/exabgp: Use exabgpcli to add/del routes

Currently, to advertise or withdraw routes with ExaBGPContainer, we need
to configure static routes via config file and restart ExaBGP daemon.
In other words, we can NOT send withdrawing advertisement with
ExaBGPContainer. Also, restating ExaBGP daemon frequently can make
scenario test unstable, and it should be avoided.

On the other hand, with ExaBGP version 4.0.5 or later(*), we can
advertise or withdraw routes using "exabgpcli" without restating ExaBGP
daemon (or writing application which calls ExaBGP's APIs).

This patch fixes to use "exabgpcli" and reduces the number of restating
ExaBGP daemon.

Note: According to this change, adding routes into ExaBGP should be
called after adding neighbor.

(*): "exabgpcli" is introduced at version 4.0.2, but has some bugs
related to Python 3 compatibility and FlowSpec rules combinations, then
we need to use version 4.0.5 or later.

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

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