Comment 21 for bug 1931737

I've rebased the master/rel_3_9 targeted branch against current master, and added a commit to address the serialization issue for pingest.pl. The new branch is available at

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/miker/lp1931737-dym-deadlock-plus-pingest