Make guests template handling more robust like host template handling

Change guest tab loading from an ajax request to an inline element
processed by Cheetah at guests.html.tmpl load time. This will eliminate
the potential for error when fetching the guest template, as well as improve
the performance of the flow. Also updated kimchi-ui.html to eliminate
potential race condition as I integrated the new guests load into the main
flow.

Signed-off-by: Adam King <rak@linux.vnet.ibm.com>