upstream: add new net.proxy_env_ignore variable

When HTTP_PROXY, HTTPS_PROXY or NO_PROXY are set in the environment, the upstream use those
defaults for proxy needs. There are cases where we don't want certain plugins use those, this new
configuration net.proxy_env_ignore disables the proxy set by environment variables and can be
used inside the plugins that relies in the upstream interface.

Signed-off-by: Eduardo Silva <[email protected]>

Author: edsiper

src/flb_upstream.c

@@ -136,6 +136,12 @@ struct flb_config_map upstream_net[] = {
      "Set the maximum number of active TCP connections that can be used per worker thread."
     },
 
+    {
+     FLB_CONFIG_MAP_BOOL, "net.proxy_env_ignore", "FALSE",
+     0, FLB_TRUE, offsetof(struct flb_net_setup, proxy_env_ignore),
+     "Ignore the environment variables HTTP_PROXY, HTTPS_PROXY and NO_PROXY when "
+    },
+
     /* EOF */
     {0}
 };