NEXUS-7601 map deferred deployed artifacts to their own distributionManagement value

NEXUS-7601 map deferred deployed artifacts to their own distributionManagement value. 
That way handle the case where each submodule is deploying to a different repository (don't rely the last module's DM section is correct for all)

Includes an integration test with 3 modules -parent, module1, module2- where the parent and module1 deploy to nexus repository but module2 changes distributionManagement section to point to file:// repository in local filesystem.