test: Fix compile error with go1.10.2
test: Fix compile error with go1.10.2

Replace Skip with Skipf in the intergration test.

Signed-off-by: Archana Shinde <047ac45ce396f63f3cf93ff43725668e736e0632@intel.com>

mikebrow/containerd,estesp/containerd,estesp/containerd,thaJeztah/containerd,containerd/containerd,containerd/containerd,vdemeester/containerd,dmcgowan/containerd,thaJeztah/containerd,dmcgowan/containerd,mikebrow/containerd,vdemeester/containerd