Create new API endpoint getRelevantErrata that takes an array of sid as parameter

[mbussolotto]

Short description

Create a new endpoint like https://www.uyuni-project.org/uyuni-docs-api/uyuni/api/system.html#apidoc-system-getRelevantErrata-loggedInUser-sid but instead of take just a sid as parameter, user can provide an array of sid.