Check /boot for free space

Perform this procedure for stand-alone and HA deployments, ensuring adequate space on all applicable machines.

1. On the SBC, check for adequate space in the /boot volume to upload the new boot image and bootloader. Use the show space boot command.

   SBC# show space boot
   boot: 24759488/25760512 bytes (99%) remaining

   You may delete files from an SFTP client if you need to free space.

   The command check-space-remaining boot performs the same function as show space boot.