oci: Extend container stop timeout
oci: Extend container stop timeout

With the recent introduction of the parallelization of multiple
containers stop, it might take more than 10 seconds to stop a
container running with Kata Containers, given the fact that the
CI runs in a nested environment.

This patch extends the minimum timeout to a larger value of 30
seconds to ensure the CI will not run into this issue anymore.

Fixes #2012

Signed-off-by: Sebastien Boeuf <90b401417360b1924ef3f520ddee932686110f85@intel.com>

mikebrow/cri-o,kubernetes-incubator/ocid,rhatdan/cri-o,nalind/cri-o,rhatdan/cri-o,mikebrow/cri-o,mikebrow/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,nalind/cri-o,kubernetes-incubator/cri-o,nalind/cri-o,rhatdan/cri-o,rhatdan/cri-o,kubernetes-incubator/ocid,mikebrow/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o