Have borrowed and owned versions of Futures w.r.t. SubmissionQueue

[Thomasdezeeuw]

Currently some Futures own a SubmissionQueue, others take a reference to it. It would be to have a mechanism where we can support both.

Maybe it's a simple as adding <SQ: AsRef<SubmissionQueue>> instead of using a SubmissionQueue.

[Thomasdezeeuw]

Signals::receive_signals is an example of where an owned version was needed.

[Thomasdezeeuw]

Inventory.

Futures that take ownership of SubmissionQueue:

• net::Socket
• process:WaitId
• process:ReceiveSignals (by design)
• fs::Rename
• fs::Delete
• fs::Open
• fs::CreateDir
• msg::MsgListener

Futures that take a reference to SubmissionQueue:

• msg::SendMsg
• poll::OneshotPoll
• poll::SubmissionQueue`.