e3775e4c1a
Related to: https://github.com/spring-cloud/stream-applications/issues/171 It might not be necessary in real world, but with `SshServer` we fail when we disconnect the session and cannot connect it back because that server decides to die for a strange reason like no connections. * Upgrade to SSHD 2.7.0 * Wrap default SFTP SF into a `CachingSessionFactory` to keep sessions opened and don't let the server to die because on connections from clients * Reenable SFTP Supplier tests