Port the pantsd nailgun server to rust#9722

Merged

stuhood merged 6 commits intopantsbuild:masterfrom stuhood:stuhood/pantsd-server-in-rust

May 13, 2020

+1,177-2,003

Commits on May 13, 2020

Do not fully initialize pantsd in the client during either launch or restart.
Stu Hood
committed
Add rust nailgun server with a callback to python.
Stu Hood
committed
Remove dead nailgun server code.
Stu Hood
committed
Remove nested Exiters in favor of a single exit function set per-process (and only called for a signal in pantsd).
Stu Hood
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Go a bit further and completely remove the exit function: sys.excepthook doesn't need us to actually exit.
Stu Hood
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Review feedback.
Stu Hood
committed