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chgserver: add an explicit gc to trigger __del__

SocketServer.ForkingMixIn uses os._exit which will skip all cleanup handlers.
We want to run __del__ to make things like transactions, {ssh,http}peer,
atomictempfile, dirstateguard, etc. work.

This patch adds a "gc.collect()" to trigger __del__. It is helpful for chg
to pass some test cases in test-devel-warnings.t.

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