Also set release-keys and disable `ro.debuggable`. Avoids "root"
detection in some banking-related apps whilst having the convenience
of userdebug builds, such as adb root or permissive selinux.
Avoid this in eng build to keep necessary debugging intact.
Change-Id: I78ec5abe4db8083c0e02157c0bcd1a3d99fb9a5d
d46c1bffa9