Check if the payload has a include_send_uuid method before calling it

[bcook-r7]

Otherwise we get an undefined method exception and the payload fails to stage.
Fixes #6040

This is sort-of nasty because it appears that we silently rescue exceptions thrown during staging, which makes this look like the stager hung (and the payload crashes) rather than a simpler-to-fix check for a method existence.

@OJ may want to refactor things so we do not need this, but this should stop the bleeding for now.

Verification steps

• Generate a 64-bit and 32-bit linux reverse TCP shell payload
• Stage it and ensure that you get a shell.

[OJ]

Thanks Brent. I've got something very similar in a branch I am going to push today. I land this as well, given that it's part of my PR, and that gets us over the initial problem. My stuff will clean things up a little, I'd appreciate your keen eye once that comes in!

Cheers

[OJ]

Ah! I see @wvu-r7 has taken it. I shall leave it to him and finish off the other stuff.

[wvu]

Lol, @OJ. I will take this, yeh? Will handle when I get home.

[OJ]

Sorted @wvu-r7 :)

[OJ]

Also tested with Window payloads with and without the _uuid support in the stager.

[wvu]

:P