Use and version flannel/cni-plugin properly

Moves us closer to using the proper upstream for our flannel CNI plugin, instead of the snapshot that is vendored into our plugins fork.

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

scripts/build

@@ -41,7 +41,7 @@ VERSIONFLAGS="
 
     -X ${PKG_CNI_PLUGINS}/pkg/utils/buildversion.BuildVersion=${VERSION_CNIPLUGINS}
     -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Program=flannel
-    -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Version=${VERSION_FLANNEL}
+    -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Version=${VERSION_FLANNEL_PLUGIN}
     -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.Commit=HEAD
     -X ${PKG_CNI_PLUGINS}/plugins/meta/flannel.buildDate=${buildDate}
 
@@ -149,8 +149,11 @@ if [ ! -x ${INSTALLBIN}/cni${BINARY_POSTFIX} ]; then
     TMPDIR=$(mktemp -d)
     trap cleanup EXIT
     WORKDIR=$TMPDIR/src/github.com/containernetworking/plugins
-    git clone -b $VERSION_CNIPLUGINS https://github.com/rancher/plugins.git $WORKDIR
+    git clone --single-branch --depth=1 --branch=$VERSION_CNIPLUGINS https://github.com/rancher/plugins.git $WORKDIR
     cd $WORKDIR
+    rm -rf plugins/meta/flannel
+    git clone --single-branch --depth=1 --branch=$VERSION_FLANNEL_PLUGIN https://github.com/flannel-io/cni-plugin.git plugins/meta/flannel
+    sed -i 's/package main/package flannel/; s/func main/func Main/' plugins/meta/flannel/*.go
     GO111MODULE=off GOPATH=$TMPDIR CGO_ENABLED=0 "${GO}" build -tags "$TAGS" -gcflags="all=${GCFLAGS}" -ldflags "$VERSIONFLAGS $LDFLAGS $STATIC" -o $INSTALLBIN/cni${BINARY_POSTFIX}
 )
 fi

scripts/version.sh

@@ -69,6 +69,7 @@ if [ -z "$VERSION_CRI_DOCKERD" ]; then
 fi
 
 VERSION_CNIPLUGINS="v1.4.0-k3s2"
+VERSION_FLANNEL_PLUGIN="v1.4.0-flannel1"
 
 VERSION_KUBE_ROUTER=$(get-module-version github.com/cloudnativelabs/kube-router/v2)
 if [ -z "$VERSION_KUBE_ROUTER" ]; then