test: add tests of graylog_ldap_setting

[suzuki-shunsuke]

No description provided.

[codecov]

Codecov Report

Merging #224 into master will increase coverage by 0.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
+ Coverage    51.1%   51.74%   +0.63%     
==========================================
  Files         125      125              
  Lines        5962     5962              
==========================================
+ Hits         3047     3085      +38     
+ Misses       2779     2719      -60     
- Partials      136      158      +22

Impacted Files	Coverage Δ
terraform/graylog/util.go	50.72% <0%> (+2.89%)	⬆️
terraform/graylog/resource_ldap_setting.go	66.66% <0%> (+21.05%)	⬆️

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