Emit connector version in error log

While here, fixed msc_set_connector_info() to use consistent
version string.

This fixes owasp-modsecurity#85.

Author: defanator

Diff for: src/ngx_http_modsecurity_common.h

@@ -54,6 +54,9 @@
     MODSECURITY_NGINX_MINOR MODSECURITY_NGINX_PATCHLEVEL \
     MODSECURITY_NGINX_TAG_NUM
 
+#define MODSECURITY_NGINX_WHOAMI "ModSecurity-nginx v" \
+    MODSECURITY_NGINX_VERSION
+
 typedef struct {
     ngx_str_t name;
     ngx_str_t value;

Diff for: src/ngx_http_modsecurity_module.c

@@ -496,6 +496,8 @@ ngx_http_modsecurity_create_main_conf(ngx_conf_t *cf)
 {
     ngx_http_modsecurity_conf_t *conf;
 
+    ngx_log_error(NGX_LOG_NOTICE, cf->log, 0, MODSECURITY_NGINX_WHOAMI);
+
     /* ngx_pcalloc already sets all of this scructure to zeros. */
     conf = ngx_http_modsecurity_create_conf(cf);
 
@@ -515,7 +517,7 @@ ngx_http_modsecurity_create_main_conf(ngx_conf_t *cf)
     }
 
     /* Provide our connector information to LibModSecurity */
-    msc_set_connector_info(conf->modsec, "ModSecurity-nginx v0.1.1-beta");
+    msc_set_connector_info(conf->modsec, MODSECURITY_NGINX_WHOAMI);
     msc_set_log_cb(conf->modsec, ngx_http_modsecurity_log);
 
     return conf;