Split clients: improved calculation of range boundaries

If the last variant was given an explicit percentage to reach 100%, it
did not cover hash values on the range boundary or due to accumulating
rounding error.  Now this corresponds to the configuration with "*".

src/http/modules/ngx_http_split_clients_module.c

@@ -182,6 +182,11 @@ ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 
     for (i = 0; i < ctx->parts.nelts; i++) {
         sum = part[i].percent ? sum + part[i].percent : 10000;
+
+        if (sum == 10000) {
+            part[i].percent = 0;
+        }
+
         if (sum > 10000) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                "percent total is greater than 100%%");

src/stream/ngx_stream_split_clients_module.c

@@ -180,6 +180,11 @@ ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 
     for (i = 0; i < ctx->parts.nelts; i++) {
         sum = part[i].percent ? sum + part[i].percent : 10000;
+
+        if (sum == 10000) {
+            part[i].percent = 0;
+        }
+
         if (sum > 10000) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                "percent total is greater than 100%%");