Making the rest of Streaming installation API public.

Something was left behind when we opened the installation API.

Bug: 152310230
Test: atest PackageManagerShellCommandTest PackageManagerShellCommandIncrementalTest IncrementalServiceTest PackageManagerServiceTest ChecksumsTest
Change-Id: Ia2d4c3f3e97c8432fcca094d6e0f4e97dcc048d4
5 files changed