text: Title: resizefs package has to trigger a block device rescan before resizing the FS
  Body: **What happened**:
  
  In some hypervisors, e.g. VMware, the new volume size is not pushed to the VM after the in-use block device extend, and you have to run the `echo 1 > /sys/block/sdb/device/rescan` manually and resize the FS manually.
  
  **What you expected to happen**:
  
  The `echo 1 > /sys/block/sdb/device/rescan` has to be executed before executing the resize2fs.
  
  The `echo '- - -' > /sys/class/scsi_host/*/scan` is not enough for the vmware VM to get the new block device geometry. Nevertheless the `echo '- - -' > /sys/class/scsi_host/*/scan` is executed only during the volume attach.
  
  **Environment**:
  - Cloud provider or hardware configuration: openstack
  - OS (e.g: `cat /etc/os-release`): coreos
  - Kernel (e.g. `uname -a`): 4.19.66-coreos
  
  Regular Cinder plugin is affected, as well as the new CSI https://github.com/kubernetes/cloud-provider-openstack/pull/620
  
  Some info https://unixutils.com/extending-space-existing-lundisk-extend-volumes-file-systems-linux/