Bug 28586: (follow-up) updated_by should be set

Bug 28586: (follow-up) updated_by should be set

This patch makes the route set the 'updated_by' attribute as well, when
resolving a return claim through the API.

Tests are added for this behavior.

To test:
1. Apply this patch
2. Run:
   $ kshell
  k$ prove t/db_dependent/api/v1/return_claims.t
=> SUCCESS: Tests pass! updated_by is set correctly!
3. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>