Remove unpacking for Docker images from upgrade.sh

After make system refactoring an upgrade tarball contains unpacked
Docker images, therefore we need to remove unnecessary unpacking code
from upgrade.sh in order to get rid of legacy code.

Also, the patch removes some obsolete targets from makefile.

Change-Id: I043f000eca6f4aff1731e2bad49aae38e9a8d1f9
Closes-Bug: #1390030
Merge "Remove unpacking for Docker images from upgrade.sh"