esp8266/modmachine: Rename machine.sleep to machine.lightsleep.
esp8266/modmachine: Rename machine.sleep to machine.lightsleep.

While keeping machine.sleep as an alias for machine.lightsleep for
backwards compatibility.

pfalcon/micropython,pozetroninc/micropython,pfalcon/micropython,pfalcon/micropython,tobbad/micropython,adafruit/circuitpython,pfalcon/micropython,pfalcon/micropython,tobbad/micropython,tobbad/micropython,henriknelson/micropython,bvernoux/micropython,kerneltask/micropython,kerneltask/micropython,tobbad/micropython,henriknelson/micropython,pramasoul/micropython,bvernoux/micropython,henriknelson/micropython,pozetroninc/micropython,trezor/micropython,adafruit/circuitpython,adafruit/circuitpython,MrSurly/micropython,trezor/micropython,selste/micropython,MrSurly/micropython,trezor/micropython,kerneltask/micropython,kerneltask/micropython,selste/micropython,trezor/micropython,bvernoux/micropython,pramasoul/micropython,kerneltask/micropython,henriknelson/micropython,bvernoux/micropython,pramasoul/micropython,pramasoul/micropython,MrSurly/micropython,trezor/micropython,pramasoul/micropython,adafruit/circuitpython,pozetroninc/micropython,MrSurly/micropython,bvernoux/micropython,selste/micropython,selste/micropython,pozetroninc/micropython,tobbad/micropython,adafruit/circuitpython,henriknelson/micropython,adafruit/circuitpython,MrSurly/micropython,pozetroninc/micropython,selste/micropython