MINOR: httpclient/mworker: disable in the master process

Disable the httpclient in the master process.
diff --git a/src/http_client.c b/src/http_client.c
index 60d05e6..0614ae7 100644
--- a/src/http_client.c
+++ b/src/http_client.c
@@ -989,6 +989,9 @@
 	int err_code = 0;
 	char *errmsg = NULL;
 
+	if (global.mode & MODE_MWORKER_WAIT)
+		return 0;
+
 	httpclient_proxy = alloc_new_proxy("<HTTPCLIENT>", PR_CAP_LISTEN|PR_CAP_INT, &errmsg);
 	if (!httpclient_proxy) {
 		err_code |= ERR_ALERT | ERR_FATAL;
@@ -1080,6 +1083,9 @@
 	struct proxy *curproxy = httpclient_proxy;
 	char *errmsg = NULL;
 
+	if (global.mode & MODE_MWORKER_WAIT)
+		return 0;
+
 	/* copy logs from "global" log list */
 	list_for_each_entry(logsrv, &global.logsrvs, list) {
 		struct logsrv *node = malloc(sizeof(*node));