ssh: Hookup channel callbacks before spawning the bridge command
ssh: Hookup channel callbacks before spawning the bridge command

The success message may be received by libssh together with
the init message causing the callback to never get executed.

Closes #6875 
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>
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