add support on web interface to power off, configure rtsp server

[zavviodotcom]

2 new files, cfg_rtsp and cfg_rtsp_save, that allow the RTSP server settings to be changed from the web interface (there is probably an easier way to do this but these files seem to work)

status file has been modified to include link to cfg_rtsp, and also to include a new button for powering off

action file has been modified to include support for powering off

[zavviodotcom]

I have modified bootstrap/www/network and data/etc/scripts/01-network as follows:

1. Disable DHCP server in client mode. Without this change, have observed that devices are getting undesired IP address from XF, when connecting devices to router to which XF has already connected as client.
2. Enable connection to open (no encryption) network. I am not sure how to separate these changes from the existing pull request. Advice is appreciated.

[pattyland]

@samtap Could you merge this and maybe make a new build?

[mbharanya]

@zavviodotcom Sorry it's a bit off topic, but how do you turn on your camera after /sbin/poweroff ? You would need to power cycle it to turn it back on. AFAIK there is no wake on LAN for wifi right?