Unify the NumOfDevices API into virnodedeviceobj.c from node_device_driver
and test_driver.  The only real difference between the two is that the test
driver doesn't call the aclfilter API.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

Use "virNodeDeviceObj" as a prefix for any external API in virnodedeviceobj

Alter the format of the code to follow more recent style guidelines of
two empty lines between functions, function decls with "[static] type"
on one line followed by function name with arguments to functions each
on one line.

Move all the NodeDeviceObj API's into their own module virnodedeviceobj
from the node_device_conf

Purely code motion at this point, plus adjustments to cleanly build.