Fixing TestInspectApiContainerVolumeDriver
Fixing TestInspectApiContainerVolumeDriver

Currently the TestInspectApiContainerVolumeDriver is testing the
existence of a volume driver without specifing any volume driver.
This commit fixes that.

Signed-off-by: André Martins <195f35574482d3cec9431e5e1d892c7e763ea9a3@gmail.com>

aditirajagopal/docker,aditirajagopal/docker,aditirajagopal/docker