[patch] KLockFile -- try harder

[Nick Shaforostoff]

This patch makes KLockFile handle pre-existing .lock files better.

Now, when existing lock file is detected, even if NoBlockFlag is specified,
LockStale or LockOK (depending on ForceFlag) is returned, instead of LockFile.

This is done now in only one while(true) cycle iteration, so it works
with NoBlockFlag.


Ok to commit?
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