misc: daemon mode refactoring:

- there is no more daemon mode disctinction between local and installed version
    - sat is launched as daemon by default, use "sat fg" to launch it foreground

src/sat.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 DEBUG=""
+DAEMON=""
 PYTHON="python2"
 
 kill_process() {
@@ -59,14 +60,15 @@ if [ $# -eq 1 ];then
     if [ $1 = "stop" ];then
         kill_process $PID_FILE "$APP_NAME"
         exit 0
-    fi
-    if [ $1 = "debug" ];then
+    elif [ $1 = "debug" ];then
         echo "Launching $APP_NAME in debug mode"
         DEBUG="--debug"
+    elif [ $1 = "fg" ];then
+        echo "Launching $APP_NAME in foreground mode"
+        DAEMON="n"
     fi
 fi
 
-DAEMON="n"
 MAIN_OPTIONS="-${DAEMON}oy"
 TAP_PATH="./"
 TAP_FILE="$APP_NAME_FILE.tac"