Revert "Packages: properly implemented deepcopy() for PackagesSources objects"

This reverts commit 432f448983ff27452d82d62314d91c942f31bce5.
Revert "Packages: expose full source list via Connector interface"

This reverts commit fe7a3e9c7a7d66cccbd825465cefcf88165a0c3a.
Packages: add and expose get_config() function to get configs for other hosts