(MODULES-10702) Make certificatestorename case insensitive.

[nicolasvan]

This makes sure that puppet run are idempotent on servers on which the Powershell WebAdministration module shows inconsistent casing for the certificate store names.

ls IIS:\SslBindings\ | ft -AutoSize

IP Address  Port    Host Name             Store  Sites
----------  ----    ---------             -----  -----
            443     somewebsite.com       My    somewebsite.com
            443     someotherwebsite.com  MY    someotherwebsite.com
0.0.0.0     8172                          MY

[codecov-commenter]

Codecov Report

Merging #280 into master will increase coverage by 0.10%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
+ Coverage   55.45%   55.55%   +0.10%     
==========================================
  Files          26       26              
  Lines        1311     1314       +3     
==========================================
+ Hits          727      730       +3     
  Misses        584      584              

Impacted Files	Coverage Δ
lib/puppet/provider/iis_site/webadministration.rb	26.61% <0.00%> (-0.22%)	⬇️
lib/puppet/type/iis_site.rb	82.91% <100.00%> (+0.17%)	⬆️
lib/puppet_x/puppetlabs/iis/iis_version.rb	100.00% <0.00%> (+3.33%)	⬆️

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