Fix bash variable input (#207)

* Fix bash variable input

This will cause error in validation.
i have tried with 
if ! msg="$(tdtool --"$input")"; then
if ! msg="$(tdtool --"${input}")"; then
if ! msg="$(tdtool --${input})"; then
without success.
The only one i got working in real life is the one in this PR.

* Trying variable with curlies

Changed frm only output errors to output all output from tdtool. 
Enables listing of devices and sensors with output to add-on log.

* Update config.json

* fix not used exec

* fix lint

* update output

tellstick/config.json

@@ -1,6 +1,6 @@
 {
   "name": "TellStick",
-  "version": "0.2",
+  "version": "0.3",
   "slug": "tellstick",
   "description": "TellStick and TellStick Duo service.",
   "url": "https://home-assistant.io/addons/tellstick/",

tellstick/run.sh

@@ -63,7 +63,7 @@ socat TCP-LISTEN:50800,reuseaddr,fork UNIX-CONNECT:/tmp/TelldusClient &
 socat TCP-LISTEN:50801,reuseaddr,fork UNIX-CONNECT:/tmp/TelldusEvents &
 
 # Run telldus-core daemon in the background
-exec /usr/local/sbin/telldusd --nodaemon < /dev/null &
+/usr/local/sbin/telldusd --nodaemon < /dev/null &
 
 # Listen for input to tdtool
 echo "[Info] Starting event listener"
@@ -72,7 +72,9 @@ while read -r input; do
     input="$(echo "$input" | jq --raw-output '.')"
     echo "[Info] Read alias: $input"
 
-    if ! msg="$(tdtool --"$input")"; then
-    	echo "[Error] TellStick Command failed -> $msg"
+    if ! msg="$(tdtool "--$input")"; then
+    	echo "[Error] TellStick Command fails -> $msg"
+    else
+        echo "[Info] TellStick Command success -> $msg"
     fi
 done