Enhance SO SDC Controller to query SOL004/SOL007 packages from SDC

• SO SDC Controller receives SDC notification for SOL004 packages
• SO SDC Controller queries SDC for SOL004 CSAR files
• SO SDC Controller receives SDC notification for SOL007 packages
• SO SDC Controller queries SDC for SOL007 CSAR files

precondition: SO SDC Controller is ready to receive SDC notifications

Postcondition: SO SDC Controller successfully queried SDC CSAR files.

Reference ONAP wiki: https://wiki.onap.org/display/DW/ETSI+Catalog+Management

If the direct SDC-ETSI Catalog Manager is available, this will be obsolete.