Possibilty to add extra options to blkdiscard command

[smallo]

In AWS EC2 instances blkdiscard is not working when cleaning a block device for Aerospike as per https://support.aerospike.com/s/article/How-to-decide-if-blkdiscard-is-preferable-to-dd

So, to do a fast clean up one might want to execute something like:

blkdiscard -z --length 8MiB /mnt/dev/some_device

By adding the possibility of sending extra options to blkdiscard.sh, executing the command above will be possible by configuring:

    local-ssd:
       hostDir: /mnt/disks
       mountDir:  /mnt/disks
       blockCleanerCommand:
         - "blkdiscard.sh"
         - -z --length 8MiB
       volumeMode: Block

[linux-foundation-easycla[bot]]

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