[Releng] Update publish scripts

- Disable P2-Admin command (and composite-repo generation)
- Fix p2 repository unzip command

Change-Id: I9d5f360088cf585978e5484aa64e026a96a4b2a4
Signed-off-by: Camille Letavernier <cletavernier@eclipsesource.com>
2 files changed