Support tablet type as input device in VM's XML.

Add support to tablet type as input devive into vmtemplate.py to
provide an absolute pointer device. This also helps with getting
a consistent mouse cursor position in VNC.

Signed-off-by: Eli Qiao <taget@linux.vnet.ibm.com>
Add PowerKVM information as ISO otpion to installation.

Signed-off-by: Paulo Vital <pvital@linux.vnet.ibm.com>