tools/unitctl: enable passing IP addresses to the 'instances new' command

* use path seperator constant from rust std package
* pass a ControlSocket into deploy_new_container instead of a string
* parse and validate a ControlSocket from argument to instances new
* conditionally mount control socket only if its a unix socket
* use create_image in a way that actually pulls nonpresent images
* possibly override container command if TCP socket passed in
* handle more weird error cases
* add a ton of validation cases in the CLI command handler
* add a nice little progress bar :)

Signed-off-by: Ava Hahn <a.hahn@f5.com>

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