Add geoip2 module and DB to nginx build

[glennslaven]

What this PR does / why we need it:
MaxMind is deprecating their legacy databases, updates for them will no longer be available after 2019-01-02. See https://support.maxmind.com/geolite-legacy-discontinuation-notice/

This adds support for the GeoLite2 databases https://dev.maxmind.com/geoip/geoip2/geolite2/ via https://github.com/leev/ngx_http_geoip2_module.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #2550

Special notes for your reviewer:
Adds the City & ASN GeoLite2 databases, subsequent PR will update the ingress controller and template

[aledbf]

@glennslaven please increase the TAG variable in the images/nginx/Makefile version

[glennslaven]

@aledbf Should that tag match the tag in the root Makefile where it sets the BASEIMAGE?

[aledbf]

Should that tag match the tag in the root Makefile where it sets the BASEIMAGE?

No, only to the Makefile in the nginx directory. This is because the image is not built and publish by travis, is a manual process after we merge this PR. Then we can update the main Makefile

[aledbf]

@glennslaven please rebase

[codecov-io]

Codecov Report

Merging #2559 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2559   +/-   ##
=======================================
  Coverage   40.68%   40.68%           
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  Files          75       75           
  Lines        5108     5108           
=======================================
  Hits         2078     2078           
  Misses       2751     2751           
  Partials      279      279

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[aledbf]

/lgtm
/approve

[aledbf]

@glennslaven thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, glennslaven

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