Executable pihole scripts

src/freedombone-app-pihole

     #cp $INSTALL_DIR/pihole/advanced/01-pihole.conf /etc/dnsmasq.d/01-pihole.conf
     cp $INSTALL_DIR/pihole/advanced/pihole.cron /etc/cron.d/pihole
     cp $INSTALL_DIR/pihole/gravity.sh /opt/$piholeBasename
+    chmod +x /opt/pihole/*.sh
 }
 
 function pihole_change_ipv4 {