Display usage of dockerctl inspect only when no argument was given
Display usage of dockerctl inspect only when no argument was given

Change-Id: I43e8d9ff799d9ca34bc66821ffdb9e55ce043483
Closes-bug: 1400776

huntxu/fuel-library,stackforge/fuel-library,huntxu/fuel-library,ddepaoli3/fuel-library-dev,stackforge/fuel-library,huntxu/fuel-library,huntxu/fuel-library,eayunstack/fuel-library,eayunstack/fuel-library,ddepaoli3/fuel-library-dev,eayunstack/fuel-library,stackforge/fuel-library,xarses/fuel-library,ddepaoli3/fuel-library-dev,ddepaoli3/fuel-library-dev,xarses/fuel-library,ddepaoli3/fuel-library-dev,eayunstack/fuel-library,huntxu/fuel-library,eayunstack/fuel-library,stackforge/fuel-library,xarses/fuel-library,xarses/fuel-library