[PyTest #27] When running under PyTest, use pytest.mark.skipif instead

[s0undt3ch]

What does this PR do?

See title

[codecov]

Codecov Report

Merging #55536 into master will decrease coverage by 0.73%.
The diff coverage is 9.49%.

@@            Coverage Diff             @@
##           master   #55536      +/-   ##
==========================================
- Coverage   18.78%   18.05%   -0.72%     
==========================================
  Files         816      785      -31     
  Lines      174955   169258    -5697     
  Branches    37562    36349    -1213     
==========================================
- Hits        32845    30544    -2301     
+ Misses     139436   136570    -2866     
+ Partials     2674     2144     -530

Flag	Coverage Δ
#archlts	18.05% <9.49%> (ø)	⬇️
#centos7	?
#proxy	?
#py2	17.85% <9.49%> (-0.72%)	⬇️
#py3	17.7% <9.49%> (-0.7%)	⬇️
#runtests	18.05% <9.49%> (-0.72%)	⬇️
#ubuntu1604	?
#zeromq	18.05% <9.49%> (-0.72%)	⬇️

Impacted Files	Coverage Δ
salt/modules/status.py	6.58% <0%> (-0.01%)	⬇️
salt/minion.py	16.48% <0%> (-3.76%)	⬇️
salt/auth/__init__.py	14.53% <0%> (-0.07%)	⬇️
salt/modules/beacons.py	7.27% <0%> (-0.56%)	⬇️
salt/utils/event.py	38.06% <50%> (+0.27%)	⬆️
salt/client/__init__.py	24.03% <9.1%> (+0.01%)	⬆️
salt/modules/dummyproxy_service.py	46.16% <0%> (-35.89%)	⬇️
salt/modules/dummyproxy_pkg.py	38.64% <0%> (-22.72%)	⬇️
salt/log/setup.py	25.84% <0%> (-21.18%)	⬇️
salt/utils/parsers.py	28.44% <0%> (-14.85%)	⬇️
... and 93 more

[codecov]

Codecov Report

Merging #55536 into master will decrease coverage by 0.73%.
The diff coverage is 9.49%.

@@            Coverage Diff             @@
##           master   #55536      +/-   ##
==========================================
- Coverage   18.78%   18.05%   -0.72%     
==========================================
  Files         816      785      -31     
  Lines      174955   169258    -5697     
  Branches    37562    36349    -1213     
==========================================
- Hits        32845    30544    -2301     
+ Misses     139436   136570    -2866     
+ Partials     2674     2144     -530

Flag	Coverage Δ
#archlts	18.05% <9.49%> (ø)	⬇️
#centos7	?
#proxy	?
#py2	17.85% <9.49%> (-0.72%)	⬇️
#py3	17.7% <9.49%> (-0.7%)	⬇️
#runtests	18.05% <9.49%> (-0.72%)	⬇️
#ubuntu1604	?
#zeromq	18.05% <9.49%> (-0.72%)	⬇️

Impacted Files	Coverage Δ
salt/modules/status.py	6.58% <0%> (-0.01%)	⬇️
salt/minion.py	16.48% <0%> (-3.76%)	⬇️
salt/auth/__init__.py	14.53% <0%> (-0.07%)	⬇️
salt/modules/beacons.py	7.27% <0%> (-0.56%)	⬇️
salt/utils/event.py	38.06% <50%> (+0.27%)	⬆️
salt/client/__init__.py	24.03% <9.1%> (+0.01%)	⬆️
salt/modules/dummyproxy_service.py	46.16% <0%> (-35.89%)	⬇️
salt/modules/dummyproxy_pkg.py	38.64% <0%> (-22.72%)	⬇️
salt/log/setup.py	25.84% <0%> (-21.18%)	⬇️
salt/utils/parsers.py	28.44% <0%> (-14.85%)	⬇️
... and 93 more