Python3 and cloud-init fix

Updates rest respose from .content to .text to avoid having to encode to UTF-8
as part of python3

Adds a serial port to the VM so that cloud-based images can run without
modification

Bug 920

Change-Id: Ie2741af544d103e44fd110917b87f650a623859d
Signed-off-by: beierl <mbeierl@vmware.com>