Extract addon.d before we run backuptool

Needed for LCD backup

Change-Id: I90f2b4ca1e534e0bb2370c7157a10e0e6282c84b
envsetup: Wait for device in installboot/installrecovery

 * Useful when you're racing against a bug that causes a kernel panic
   shortly after USB turns on :(

Change-Id: I2a503e4b195e632ed5b67a77b942e80c47d0ff45