[vSphere] Support datacenters that are located below folders not in root folder
(cherry picked from commit 31cbf48f937a148c68687777d68b95f2c5d52d01)

Signed-off-by: Marc Grimme <grimme@atix.de>

Conflicts:
	lib/fog/vsphere/requests/compute/list_datacenters.rb
Patched gemspec for testinggit add fog.gemspec