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Fix PS-4328, a crash that occurs when out of locks #443

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PS-4328 describes a crash in the FT locktree that is caused when the memory
used for locks exceeds the locktree limit AND pending lock requests are
retried. The lock request retry logic did not handle this case and crashed.

This pull request:

Contains locktree test cases that expose this problem.
Contains ydb test cases that expose this problem. These test cases shows
that DB->put can return the TOKUDB_OUT_OF_LOCKS error when the locktree
memory exceeds its limit. This is a normal case.
Contains a bug fix in the lock request retry logic that correctly handles
the TOKUDB_OUT_OF_LOCKS error by terminating the pending lock request with
the TOKUDB_OUT_OF_LOCKS error. The application logic using the FT library
SHOULD handle this error.
Tools:
Ubuntu 19.10, Clang 7,8,9, Gcc 7,8,9, Cmake 3.14

Copyright (c) 2020, Rik Prohaska
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

tokuft test version.  rename tokuft test version to avoid conflict.
bug when the lock memory use is over the limit.  The ydb tests
show that DB->put normally returns TOKUDB_OUT_OF_LOCKS when the
lock memory use is over the limit.
retry occurs and the lock memory use is over the limit, then pending
lock requests should be completed with TOKUDB_OUT_OF_LOCKS result.
The current code does not handle this case and crashes.  This commit
fixes this case and is sufficient to fix PS-4328.
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