David Michael e630a36e50 Revert "build_image: Remove disable_read_write variable"
This reverts commit a7ffba9a9f5c18bdc8ab5495b81855bc5ba76c19.

The build_image script can build multiple formats.  When our
releases and automated builds are creating developer containers and
production images from the same command, the verity flag would be
disabled while building the container and remain disabled when building
the production image.  This resulted in no verity in all our builds.
2017-02-02 15:08:43 -08:00
..
2016-12-01 10:09:51 -08:00