Add swift config option to service_available group

This commit adds a new config option, swift, to the service_available
group. This option can be used to specify whether swift is running.
It also adds a skip to the base object test class, replacing the
endpoint detection skip.

Change-Id: I8d81071cf5077fb880f04c04b330b1f4132a58f0
Add nova config option to service_available group

This commit adds a new config option, nova, to the service_available
config group. This option is used to specify whether nova is running
or not. It also add a skip to base compute api test class.

Change-Id: I658f70f259734e366cecce1c8e0409255351af87
Move heat_available option to service_available

This commit moves the heat_available config option from the
orchestration group to under the service_available group. The option
is also renamed to heat.

Change-Id: I86c93331a53b5a7323afe27839338ffa1428015f