extract_utils: Generate deodexed apk/jar with consistent checksum

 * zip stores timestamp for all included files. The timestamps of dex
   files are different across different runs, result in inconsistent
   checksum of output apk/jar.
 * Workaround the issue by using fixed timestamp for dex files.

Change-Id: I21f3a7e32cdfdb07c5f5c140df2e797efd4a8005