Add --full-build and --deps-build features

Add --full-build and --deps-build features

With gbs build --full-build option, gbs will download the whole profile's
source codes except the local package(s) from remote snapshot and perform
building.

With gbs build --deps-build option, gbs will analyse the reverse dependency
of local package(s) and download them from remote snapshot and perform building.

Change-Id: I1f62fa5e2f4741f706d4f7fab5c378a9b5859edf