Derive is_transport_server from transport count

I have two different kinds of servers - transport servers (which connect to
legacy networks and have s2s disabled) and non-transport servers (which are
XMPP-only and have s2s enabled).

I previously had an is_transport_server boolean defined for each host in the
inventory - however, this is duplicated information that can be derived from
the length of the transports value (which lists the legacy networks to
transport to).

Transport servers have a non-empty transports list, while non-transport servers
do not define the variable at all. So, handle this case in the playbook by
deriving an empty list if the value is not present.

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