cri-integration: propagate ENABLE_CRI_SANDBOXES
cri-integration: propagate ENABLE_CRI_SANDBOXES

sudo(8) strips environment variables by default.  Explicitly set
ENABLE_CRI_SANDBOXES so we can ensure we test the sbserver CRI
implementation.

Signed-off-by: Samuel Karp <97468ec0e303d67c50f7bb93576f42916fd517d7@google.com>

estesp/containerd,containerd/containerd,estesp/containerd,mikebrow/containerd,thaJeztah/containerd,mikebrow/containerd,containerd/containerd,thaJeztah/containerd