Enable update for existing resources

[Carlos Vitor Barros]

Excluding vcs_root_git, which is a resource with possible dependencies, all other resources, such as:

• build_trigger_build_finish
• build_trigger_vcs
• build_trigger_schedule
• feature_commit_status_publisher
• snapshot_dependency
• artifact_dependency

Can have their update cabability by simply replacing the resource in place, requiring destroy/create cycle.