[virt-tools-list] Error connecting to remote console session

[Nathan Bird]

The current implementation of connecting to a VNC console on remote 
hypervisor via qemu+ssh where the VNC listen address is localhost 
doesn't work.

I think this was originally introduced in 422c0216d8 (which is what 
ubuntu packaged causing me to chase this down). However, the refactoring 
in a455ba72b6 changed the code leaving a new version of the bug in place.

The code (HEAD) is using the `is` operator (identity) to compare strings 
where equality is desired. This has the result of not setting up the 
tunnel over ssh to the remote server when required. The following patch 
fixes that.

Regards,
Nathan Bird
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