lxc/image: add new column shorthand char 'F' that displays the full image hash/fingerprint
lxc/image: add new column shorthand char 'F' that displays the full image hash/fingerprint

  * This is useful for shell scripts wanting the full image hash from csv output.

  $ lxc image list -clF
  +---------------------+------------------------------------------------------------------+
  |        ALIAS        |                           FINGERPRINT                            |
  +---------------------+------------------------------------------------------------------+
  | alpine/3.4 (3 more) | cc8b580121227c92e05123e00cc52046b0139253db2c7a034234915f05a43eeb |
  +---------------------+------------------------------------------------------------------+

  $ lxc image list -clF --format=csv
  alpine/3.4 (3 more),cc8b580121227c92e05123e00cc52046b0139253db2c7a034234915f05a43eeb

Signed-off-by: fqbuild <a15bd1d84cff142ab83474f297c799e749a674ac@users.noreply.github.com>

lxc/lxd,Skarlso/lxd,stgraber/lxd,atxwebs/lxd,stgraber/lxd,hallyn/lxd,mjeanson/lxd,stgraber/lxd,lxc/lxd,Skarlso/lxd,lxc/lxd,mjeanson/lxd,hallyn/lxd,lxc/lxd,Skarlso/lxd,atxwebs/lxd,mjeanson/lxd,atxwebs/lxd,atxwebs/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,Skarlso/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd