Teach DBS to find and use mpirun found at /usr/bin.

[KineticTheory]

Details

• Minor tweak in build system logic to fix redmine issue 1242

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • Travis CI checks pass
  • Code coverage does not decrease
  • Valgrind test passes
  • Toss3 checks pass
  • Trinitite checks pass
  • Code reviewed/approved, sufficient DbC checks, testing, documentation

[alexrlongne]

@KineticTheory LGTM. Do you want to wait for @clevelam to try it?

[codecov]

Codecov Report

Merging #620 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop    #620   +/-   ##
=======================================
  Coverage     93.7%   93.7%           
=======================================
  Files          381     381           
  Lines        17819   17819           
=======================================
  Hits         16708   16708           
  Misses        1111    1111

[KineticTheory]

@KineticTheory LGTM. Do you want to wait for @clevelam to try it?

Go ahead and merge it. I'll ask @clevelam to test on his machine when he has time.