commit d0b0c6abafa250d5afb5a8df217bd3bd312b16f7
author Milton D. Miller II <miltonm@us.ibm.com> Sun Feb 28 16:32:14 2016 -0600
committer Milton D. Miller II <miltonm@us.ibm.com> Thu Mar 03 14:47:01 2016 -0600
tree f36dd0a8e133a81474df83814109b4dfacb707c1
parent 32429c4a0978ac19add2fe357d6760f6d2950a8d

update: Add command line parsing to clean or preserve saved files

Because update now returns to shutdown for the final halt or
reboot system call it does not need to handle systemd arguments.
Instead update is being invoked from multiple environments, and
further environments will need alternate behaviors.

Add a code to start parsing the command line.  Start wtih a flag
to clean the saved files at the end of the update process.

This will reclaim the space and prevent stale saved files
from being restored without requiring the calling script to
know the location of the saved files directory.

Parse true and complement actions in case we decide to change
the defaults later.

For now keep the user feature of calling update, flashing some
files by hand, then a final call to update with a possibly
empty image file will have the original saved files merged
into the rwfs.

Signed-off-by: Milton Miller <miltonm@us.ibm.com>