patchman -a sets the wrong errata argument

[sr-rossanderson]

The -a convenience option is intended to execute the full Patchman maintenance workflow, including errata processing.

However, the CLI currently appears to set:

args.errata = True

while the later processing code checks:

args.update_errata

Expected behaviour:

-a should set all of the same internal arguments as the documented group of individual maintenance options.

Suggested fix:

Change args.errata = True to args.update_errata = True, or otherwise ensure that -a uses the same argument consumed by downstream processing.

Impact:

Scheduled jobs using patchman -a may appear to complete successfully while not performing all documented maintenance operations.