tests: Move common fixtures to conftest.py

[codecov[bot]]

Codecov Report

Merging #541 into gonzobot will increase coverage by 0.46%. The diff coverage is 100%.

@@             Coverage Diff              @@
##           gonzobot     #541      +/-   ##
============================================
+ Coverage     47.45%   47.92%   +0.46%     
============================================
  Files           223      226       +3     
  Lines         13305    13409     +104     
============================================
+ Hits           6314     6426     +112     
+ Misses         6991     6983       -8

Impacted Files	Coverage Δ
tests/plugin_tests/test_duckhunt.py	100% <ø> (ø)	:arrow_up:
tests/plugin_tests/test_dogpile.py	100% <ø> (ø)	:arrow_up:
tests/plugin_tests/test_shorten.py	100% <ø> (ø)	:arrow_up:
tests/plugin_tests/test_utility.py	100% <ø> (ø)	:arrow_up:
tests/plugin_tests/test_tell.py	100% <100%> (ø)	:arrow_up:
tests/plugin_tests/test_xkcd.py	100% <100%> (ø)	:arrow_up:
tests/plugin_tests/test_weather.py	100% <100%> (ø)	:arrow_up:
tests/plugin_tests/test_link_announcer.py	100% <100%> (ø)	:arrow_up:
tests/plugin_tests/test_metars.py	100% <100%> (ø)	:arrow_up:
tests/plugin_tests/test_randomusefulwebsite.py	100% <100%> (ø)	:arrow_up:
... and 23 more

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