plugin: Set unused_tcp_port_factory scope to 'session'

[romainletendart]

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.

[romainletendart]

Hi @Tinche,
What do you think about this change?
I proposed it since I needed a session-scoped factory involving unused_tcp_port_factory and couldn't simply pass the latter as an argument to my factory because of the ScopeMismatch.
I foresee others might also encounter the issue one day and it's an easy one to fix.

[RemiCardona]

Hi all, this looks like a fairly straightforward change. Is there anything I can do to help get this merged?

Thanks

[Tinche]

Add a CHANGELOG entry and this can go in :)

[romainletendart]

@Tinche Done. :)

[Tinche]

@romainletendart sweet, please include a link to the PR like previous changes and let's get this merged and released :)

[romainletendart]

@Tinche Done. :)

[Tinche]

Thanks, I will release this in the next couple of days!

[romainletendart]

Hi @Tinche!
Do you have any news on an upcoming release?