Pack system/update_engine/scripts into otatools.zip.

The scripts will be needed by OTA releasetools, for parsing A/B OTA
payload.

Bug: 65261072
Test: `m otatools-package` and check for system/update_engine/scripts.
Change-Id: I5cb54561a5fb0454a37879ca20afa95b82ffdefe
1 file changed