Fix deterministic service port derivation

[ofek]

I encountered a conflict on my Windows machine with an ephemeral port once or twice. The dynamic/private port range should never have been used.

There's a theoretical backward incompatibility issue where one updates dda while a developer environment is active and further SSH communication fails. It's quite easy to recreate an environment so I opted to not implement a specific hack to account for this.

[datadog-prod-us1-4]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 71.07% (+0.02%)

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