Expose power cap min/max on dbus

The min and max power cap values will be read from sysfs files and then
the data will be put on the dbus. This will allow users to know the
valid range of power cap available.

The PowerCap object was moved from Manager to Status.

Change-Id: I5196cc8645f84c31a5282cf844109bae47b09bf7
Signed-off-by: Chris Cain <cjcain@us.ibm.com>
9 files changed