Merge branch 'jk/test-lsan-denoise-output'

Tests with LSan from time to time seem to emit harmless message
that makes our tests unnecessarily flakey; we work it around by
filtering the uninteresting output.

* jk/test-lsan-denoise-output:
  test-lib: ignore uninteresting LSan output

t/test-lib.sh

@@ -334,6 +334,7 @@ nr_san_dir_leaks_ () {
  find "$TEST_RESULTS_SAN_DIR" \
  -type f \
  -name "$TEST_RESULTS_SAN_FILE_PFX.*" 2>/dev/null |
+ xargs grep -lv "Unable to get registers from thread" |
  wc -l
 }