Completely integrate HFM into Settings [1/4]

* Checks if hosts file is correct after completing boot (useful after updating ROM)
* One less package

PS3: a symlink is created instead of a copy + no need to reboot to apply change
PS4: reverted to copying file instead of symlinking
PS5: delete hosts file before copying to make sure to replace even an existing symlink
PS6: set correct permissions after copying

Change-Id: Ie221748a7f524414999fa0a49111a47a9a92c8a3
Merge "Completely integrate HFM into Settings [1/4]" into du44