Wait until no LEDs are blinking anymore before going to sleep.
Decrement LED blink counter before acting on the value, otherwise LED
state will always lag behind.
Removing MY_LED_BLINKING_FEATURE, as we now are
using MY_DEFAULT_LED_xx_PIN defines to enable
LED blinking feature.
updated Gateway sketches to not refer to
MY_LED_BLINKING_FEATURE any more
fixes#562