Support http protocol versions besides 0.9, 1.0, 1.1, 2.0 #225
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This pull request was prompted by owasp-modsecurity/ModSecurity#2380.
Until this change, any HTTP protocol version other than 0.9, 1.0, 1.1, and 2.0 would actually result in the ModSecurity-nginx connector passing a value of "1.0" to ModSecurity's msc_process_uri function.
With this change, any characters following the five-character 'HTTP/' protocol prefix will get passed to ModSecurity, as long as nginx has successfully populated ngx_http_request_t->http_protocol.