1531: Add label to termination hang prints

[PhilMiller]

Fixes #1531

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The following tests FAILED:
  434 - vt:TestMpiAccessGuardDeathTest.test_mpi_access_prevented_proc_2 (Failed)

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[codecov]

Codecov Report

Merging #1532 (b2ec40f) into develop (dc98da1) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           develop    #1532   +/-   ##
========================================
  Coverage    82.85%   82.85%           
========================================
  Files          780      780           
  Lines        29394    29394           
========================================
  Hits         24355    24355           
  Misses        5039     5039           

Impacted Files	Coverage Δ
src/vt/termination/termination.cc	71.58% <0.00%> (ø)

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