plugin: Set unused_tcp_port_factory scope to 'session' #163
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Factories in pytest usually have a scope greater than 'function' to allow
one use the same factory within bigger scopes. Let us allow
unused_tcp_port_factory to be used throughout the same session scope.
This will allow other session-scoped factories depend on
unused_tcp_port_factory without getting a "ScopeMismatch" error.