* === added directory cmd/hockeypuck-import, cmd/hockeypuck-
  import/main.go, openpgp/add.go, openpgp/db.go, openpgp/loader.go,
  openpgp/schema.go, openpgp/worker.go:
  - Add bulk loading support without FK constraints. LP: #1208295.
* cmd/hockeypuck-import/main.go, openpgp/add.go, openpgp/io.go,
  openpgp/loader.go, openpgp/resolve.go, openpgp/resolve_test.go,
  openpgp/schema.go, openpgp/signature.go,
  openpgp/testdata/252B8B37.dupsig.asc,
  openpgp/testdata/lp1195901_2.asc, openpgp/testdata/lp1195901.asc,
  openpgp/userattribute.go, openpgp/userid.go, openpgp/worker_test.go:
  - Fix rules for choosing a primary UID. LP: #1195901
  - Support bulk loading, refactor out common functionality. LP: #1208295
    Drop all constraints for bulk loading.
  - Don't leak keyring file descriptors in hockeypuck-import.
  - Add some test cases.