Add user pihole if user does not exsist

Check if user pihole exist and add if not.  This will give pihole its
own system user without a login or home directory that is not system
dependent.

automated install/basic-install.sh

@@ -375,7 +375,7 @@ stopServices
 $SUDO mkdir -p /etc/pihole/
 $SUDO chown www-data:www-data /var/www/html
 $SUDO chmod 775 /var/www/html
-$SUDO usermod -a -G www-data pi
+$SUDO usermod -a -G www-data pihole
 $SUDO lighty-enable-mod fastcgi fastcgi-php
 installScripts
 installConfigs
@@ -397,6 +397,18 @@ If you set a new IP address, you should restart the Pi.
 The install log is in /etc/pihole." $r $c
 }
 
+setUser()
+{
+# Check if user pihole exists and create if not
+echo "Checking if user 'pihole' exists..."
+if id -u pihole >/dev/null 2>&1; then
+        echo "User 'pihole' already exists"
+else
+        echo "User 'pihole' doesn't exist.  Creating..."
+		$SUDO useradd -r -s /usr/sbin/nologin pihole
+fi
+}
+
 ######## SCRIPT ############
 # Start the installer
 welcomeDialogs