fix(ssh): allow multiplexed connection #3658
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A Multiplexing connection can send more than one channel request over the same socket, making possible reuse the authentication method used by the master in the derivate ones.
To support it, we should only allow the GliderSSH's server to dial with the connection on the agent's side, removing our intervention on the protocol flow, that enforces the channel limitation, just sending the device's response to the client.
Closes #3656