OmniSwitch: simplify and cleanup

-use start on boot as default for enable
-remove unneeded broadcasts

Change-Id: I39b6c1b00c589b81367722450ccb057769ebcb51
Merge branch 'android-4.4' of https://github.com/omnirom/android_packages_apps_OmniSwitch into android-4.4

Conflicts:
	src/org/omnirom/omniswitch/SwitchService.java