Added a new clause for custom http_top.conf above the include clauses for NPM-generated files. Allows for more flexibility with adding custom nginx .conf files to NPM
Use case: adding a configuration change needs to be present before other custom configuration files are called and reference configuration from the custom http_top.conf file.
Example: add a new log_format in http_top.conf, then referencing it in a access_log clause in server_proxy.conf.
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