ota-server should have own settings for WiFi params

[pfalcon]

Currently, ota-server uses whatever is stored in FlashROM configuration, so if for example if WiFi interfaces are disabled, there won't be any OTA. So, it optionally should have own settings, and use non-storing APIs to set them.

[pfalcon]

Params should be set using #14

[jedie]

I also think it's useless to wait for an OTA update when there is no WiFi connection ;)