convert lockContent to use new LockPools

Also cleaned up the code, avoiding creating a lock file if we're going to
open it for create later anyway.

And, if there's an exception while preparing to lock the file, but not at
the point of actually taking the lock, throw an exception, instead of
silently not locking and pretending to succeed.

And, on Windows, always use lock file, even if the repo somehow got into
indirect mode (maybe with cygwin git..)

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