ovn-architecture: Use the default key length in examples
This commit removes the explicit set of 1024-bit RSA keys on
ovn-architecture examples and so the default (2048-bit) is used.
Tested-by: Maxime Coquelin
Creating SSL certificates for each chassis with the certificate CN field
set to the chassis name (e.g. for a chassis with
<code>external-ids:system-id=chassis-1</code>, via the command
- "<code>ovs-pki -B 1024 -u req+sign chassis-1 switch</code>").
+ "<code>ovs-pki -u req+sign chassis-1 switch</code>").
</li>
<li>
Configuring each ovn-controller to use SSL when connecting to the
