[stable-2] mysql_user: fix parsing privs when a user has roles assigned to it

[Andersson007]

SUMMARY

backport of #341

[codecov]

Codecov Report

Merging #345 (78ef308) into stable-2 (d61d442) will increase coverage by 0.03%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##           stable-2     #345      +/-   ##
============================================
+ Coverage     75.77%   75.80%   +0.03%     
============================================
  Files            26       26              
  Lines          2291     2294       +3     
  Branches        556      557       +1     
============================================
+ Hits           1736     1739       +3     
  Misses          380      380              
  Partials        175      175              

Impacted Files	Coverage Δ
plugins/module_utils/user.py	81.19% <66.66%> (+0.12%)	⬆️

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