Add webkit and package-manager to qt4e image, change to IPK from RPM

Using the new package type of IPK will allow us to update packages for
clients in the field (e.g. Python).

Signed-off-by: Stephano Cetola <scetola@reachtech.com>
Add package manager to both X11 and Qt4X11 images.

This update allows the aforementioned images to update packages using
the opkg tool.

Signed-off-by: Stephano Cetola <scetola@reachtech.com>