This version is required to integrate with clusterctl.
Starting v0.0.6 cobra Execute() method returns ErrSubCommandRequired if
command is executed when its not runnable (Run or RuneE == nil), hence
all tests that invoke such commands need to be either remove or adjusted
to expect these errors
Change-Id: Ia7935c1bf83d47b3a7d3a6c03d1989d53ad57a9a
Relates-To: #187