Make sure IpGeolocationMiddleware skips localhost

[acelaya]

This PR brings back some logic that was lost while migrating geolocation logic from LocateVisit event to IpGeolocationMiddleware #2266, to make sure localhost addresses resolve to an empty location rather than trying to geolocate them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.70%. Comparing base (8298ef3) to head (f57f159).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2272      +/-   ##
=============================================
+ Coverage      93.66%   93.70%   +0.03%     
+ Complexity      1658     1657       -1     
=============================================
  Files            274      274              
  Lines           5780     5780              
=============================================
+ Hits            5414     5416       +2     
+ Misses           366      364       -2     

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