[TD-1933]<fix>: input fqdn and email during rpm package install

packaging/tools/post.sh

@@ -121,7 +121,10 @@ function install_config() {
     echo -e -n "${GREEN}Enter FQDN:port (like h1.taosdata.com:6030) of an existing TDengine cluster node to join${NC}"
     echo
     echo -e -n "${GREEN}OR leave it blank to build one${NC}:"
-    read firstEp
+    #read firstEp
+    if exec < /dev/tty; then
+    	read firstEp;
+	fi
 	while true; do
         if [ ! -z "$firstEp" ]; then
             # check the format of the firstEp