cni: Use the vendored version of CNI plugins to install binaries

Out CI is failing because of a recent change introduced in the
CNI plugins repo(github.com/containernetworking/plugins) that vendors in
CNI v0.7.0-alpha0. Refer to commit #e4fdb6cd1883b7b.

However, it looks like the the plugins themselves have not been
updated yet, causing failures in CI. This was verified by vendoring
in the latest CNI and CNI plugins in our repo.

Till the plugin binaries our fixed, use older version of CNI plugins
for testing virtcontainers. See this:
containernetworking/plugins@68b4efb4056c

In any case we should keep this version
in sync with what we vendor in, in our runtime and not use the
latest commit.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

virtcontainers/utils/virtcontainers-setup.sh

@@ -60,12 +60,13 @@ echo -e "Move to ${tmpdir}/${virtcontainers_build_dir}"
 pushd ${tmpdir}/${virtcontainers_build_dir}
 echo "Clone cni"
 git clone https://github.com/containernetworking/plugins.git
+pushd plugins
+git checkout 7f98c94613021d8b57acfa1a2f0c8d0f6fd7ae5a
 
 echo "Copy CNI config files"
 cp $GOPATH/src/github.com/kata-containers/runtime/virtcontainers/test/cni/10-mynet.conf ${ETCDIR}/cni/net.d/
 cp $GOPATH/src/github.com/kata-containers/runtime/virtcontainers/test/cni/99-loopback.conf ${ETCDIR}/cni/net.d/
 
-pushd plugins
 ./build.sh
 cp ./bin/bridge ${TMPDIR}/cni/bin/cni-bridge
 cp ./bin/loopback ${TMPDIR}/cni/bin/loopback