Implement GET /orders/order-lines endpoint

To do:

• Due to naming collisions in the model classes generated by RMB (jsonschema2pojo plugin) the acq-models PR #48 needs to be merged. Once this is done the following modules have to be updated to consume schema change:
  • UI orders app
  • mod-gobi
• Update order.raml
  • Update types adding/updating:

      po-line-collection: !include acq-models/mod-orders-storage/schemas/po_line_collection.json
      po-line: !include acq-models/mod-orders-storage/schemas/po_line.json
      composite-po-line: !include acq-models/composite_po_line.json
    

  • Add new endpoint definition
  • Update existing endpoint definitions to consume composite-po-line type
• Update ModuleDescriptor-template.json adding new GET /orders/order-lines endpoint definition and required permissions
• Business logic updates
  mod-orders should re-translate the incoming request to mod-orders-storage with some notes:
  • The offset, limit and lang parameters should be added as is to the storage's request
  • In case the request does not contain query parameter or it is empty, query must not be added to the storage's request
  • In case the request contains not empty query parameter, the value has to be encoded and resulting query parameter added to the storage's request
  • GET request should be sent to /orders-storage/po-lines endpoint and the resulting response should be returned back to client as is

Acceptance Criteria:

• New endpoint is implemented
• Unit tests are added
• API tests are updated