Stop exposing exceptions on locust module, remove old wait api (step 1 of fixing #1328)

[cyberw]

No description provided.

[codecov]

Codecov Report

Merging #1329 into master will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1329      +/-   ##
==========================================
+ Coverage   80.63%   80.82%   +0.18%     
==========================================
  Files          24       24              
  Lines        2184     2169      -15     
  Branches      334      329       -5     
==========================================
- Hits         1761     1753       -8     
+ Misses        335      329       -6     
+ Partials       88       87       -1     

Impacted Files	Coverage Δ
locust/util/deprecation.py	75.00% <ø> (-1.20%)	⬇️
locust/core.py	96.31% <100.00%> (-0.50%)	⬇️
locust/web.py	91.07% <0.00%> (+0.59%)	⬆️
locust/runners.py	79.43% <0.00%> (+0.86%)	⬆️

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[heyman]

👍 LGTM