👌 Allow remote copying/symlinking between computers with same hostname

[mbercx]

Fixes #6136

[khsrali]

Thanks, @mbercx.
After looking at your issue #6136, I think one can add an extra check if both computers are using the same transport plugins.

Also, instead of changing the if condition, I would do it in the else block instead, because in case the server wouldn't allow it --for security reasons, etc--, it's probably better to catch the very similar errors (FileNotFoundError / OSError ) in a different place, for debugging, logging messages, etc.. as they have different nature.

Note also, the destination_path input in many methods in transport plugins: copy, get, put can be relative paths!,, so these methods need to be called with an absolute path if an operation between two computers is intended.

Just fished out another issues related to yours :) #1641