API feedback: getVersion instead of isV2.

Bug: 181015045
Fixes: 181015045
Test: atest PackageManagerShellCommandTest PackageManagerShellCommandIncrementalTest IncrementalServiceTest PackageManagerServiceTest ChecksumsTest
Change-Id: I623f73b834759d9a1c599d7c7f3ff585fa75c4aa
3 files changed