Executing modprobe in agent pod

Fixes https://github.com/rook/rook/issues/1062

tests/scripts/kubeadm-install.sh

@@ -15,7 +15,6 @@ then
     sudo mkdir -p /usr/libexec/kubernetes/kubelet-plugins/volume/exec/rook.io~rook
     cat << EOF | sudo tee -a /usr/libexec/kubernetes/kubelet-plugins/volume/exec/rook.io~rook/rook
 #!/bin/bash
-modprobe rbd single_major=Y > /dev/null
 echo -ne '{"status": "Success", "capabilities": {"attach": false}}' >&1
 exit 0
 EOF

tests/scripts/kubeadm.sh

@@ -141,9 +141,6 @@ case "${1:-}" in
             exit 1
         ;;
     esac
-    sudo cp ${scriptdir}/kubeadm-rbd /bin/rbd
-    sudo chmod +x /bin/rbd
-    docker pull ceph/base || true
     ;;
   wait)
     if [ "$#" -eq 2 ]; then

tests/scripts/minikube.sh

@@ -6,7 +6,6 @@ source "${scriptdir}/../../build/common.sh"
 init_flexvolume() {
     cat <<EOF | ssh -i `minikube ssh-key` docker@`minikube ip` -o IdentitiesOnly=yes -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o LogLevel=quiet 'cat - > ~/rook'
 #!/bin/bash
-modprobe rbd single_major=Y > /dev/null
 echo -ne '{"status": "Success", "capabilities": {"attach": false}}' >&1
 exit 0
 EOF