Grab stack traces when unit test hangs

[cole-miller]

We know which binary is hanging now, try to get some backtraces using GDB if it looks like it's hanging.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.91%. Comparing base (f1dc507) to head (494d6e7).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #694      +/-   ##
==========================================
+ Coverage   77.87%   77.91%   +0.04%     
==========================================
  Files         197      197              
  Lines       28008    28011       +3     
  Branches     5541     5536       -5     
==========================================
+ Hits        21812    21826      +14     
+ Misses       4350     4329      -21     
- Partials     1846     1856      +10     

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[cole-miller]

Running the unit test with --no-fork exposed a pre-existing minor test issue where we weren't using the test/lib/sqlite.c fixture everywhere we should---I just fixed this quickly as well.