chg: remove locks
See the previous two patches for the reason. The advantage is a simplified
code base and better throughput when starting multiple servers with multiple
confighashes. The disadvantage is starting multiple servers in parallel with
a single confighash will waste some CPU time, which is probably fine in
common use-cases.
This makes it easier to switch to relative paths to support long unix domain
socket paths.
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273ce12ad8f1` will report some style violations on a very old commit).