put back the unused virtuals in Vector<>

some binaries are using these private APIs and broke
(as they should!) with this change. Temporarily restore the
virtuals to work around this.

Bug: 6977550
Change-Id: I7c37f24b16e4d586b89205c493db5169cf87e024
Add support for exec command in init scripts.

Change-Id: Iee523fd75410718f0bd090f5fdcba50825a698c4
Fix for ADB in recovery mode