Add https support to check_http_send

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trafficstars

Issue: The nginx module does not supports a health check with https. This Pull Request provides the new type https.

e.g:

   upstream  test-upstream{

     server test.server.de:443 weight=1;
     server test.server.de:443 weight=1;

     check interval=3000 type=https rise=4 fall=2 ;
     check_http_send "GET /api/getServerStatus HTTP/1.0\r\n\r\n";

     keepalive 64;
   }

• Cherry picked commit 79ba411d4014be5c1ce6bbe762366a25109e18ff from https://github.com/Refinitiv/nginx_upstream_check_module.git
• fixes #253

[noeldamps]

@yaoweibin can You please Review the pull request?