Add Coverage to check runtime status

[szuananwar]

This test will add coverage in the runtime status check for the case when only max runtime is specified and for the case when both max and min runtime are specified in the buildspec.

[codecov]

Codecov Report

Patch coverage: 51.28% and project coverage change: +0.53 🎉

Comparison is base (2d37b2a) 77.86% compared to head (d256828) 78.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1564      +/-   ##
==========================================
+ Coverage   77.86%   78.39%   +0.53%     
==========================================
  Files          57       56       -1     
  Lines        6621     6558      -63     
==========================================
- Hits         5155     5141      -14     
+ Misses       1466     1417      -49     

Impacted Files	Coverage Δ
buildtest/cli/__init__.py	100.00% <ø> (ø)
buildtest/cli/config.py	86.76% <ø> (ø)
buildtest/executors/cobalt.py	21.51% <0.00%> (-0.60%)	⬇️
buildtest/executors/lsf.py	19.28% <0.00%> (-0.72%)	⬇️
buildtest/executors/pbs.py	21.43% <0.00%> (-0.49%)	⬇️
buildtest/executors/slurm.py	20.51% <0.00%> (-0.74%)	⬇️
buildtest/cli/report.py	96.02% <88.24%> (+6.13%)	⬆️
buildtest/builders/base.py	89.46% <100.00%> (+0.13%)	⬆️
buildtest/executors/local.py	98.00% <100.00%> (+3.77%)	⬆️

... and 2 files with indirect coverage changes

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