[blackduck] Export tree-ouput does not work on Golang

[JeroenKnoops]

Problem

When creating a tree output from a blackduck project with Golang components, the tree output does generate github and generic packages.

Package-url spec

https://github.com/package-url/purl-spec/blob/master/PURL-TYPES.rst#golang

Both tree and spdx outputs are wrong

tree output

Command

spdx-builder blackduck --tree project version

Example part of the tree output

TREE start ----------8<----------
pkg:generic/project@version
  pkg:github/golang/[email protected] [dynamic]
  pkg:github/google/[email protected] [dynamic]
  pkg:github/kubernetes-sigs/[email protected] [dynamic]
    pkg:generic/[email protected] [dynamic]
    pkg:generic/uber-go%[email protected] [dynamic]
    pkg:github/beorn7/[email protected] [dynamic]
...

Expected tree output

TREE start ----------8<----------
pkg:golang/project@versoin
  pkg:golang/github.com/golang/[email protected] [dynamic]
  pkg:golang/github.com/google/[email protected] [dynamic]
  pkg:golang/github.com/kubernetes-sigs/[email protected] [dynamic]
    pkg:golang/google.golang.org/[email protected] [dynamic]
    pkg:golang/google.golang.org/uber-go%[email protected] [dynamic]
    pkg:golang/google.golang.org/beorn7/[email protected] [dynamic]
...

spdx output

Command

spdx-builder blackduck -o output.spdx project version

Example part of the spdx output

## Start of package pkg:github/golang/[email protected]
PackageName: golang/mock
SPDXID: SPDXRef-7
PackageVersion: v1.4.4
PackageSummary: golang-mock
PackageDescription: GoMock is a mocking framework for the Go programming language.
PackageHomePage: https://github.com/golang/mock
ExternalRef: PACKAGE-MANAGER purl pkg:github/golang/[email protected]
PackageDownloadLocation: NOASSERTION
PackageLicenseConcluded: Apache-2.0
PackageLicenseDeclared: NOASSERTION
FilesAnalyzed: false
PackageCopyrightText: NOASSERTION
...

Expected spdx output

## Start of package pkg:golang/github.com/golang/[email protected]
PackageName: golang/mock
SPDXID: SPDXRef-7
PackageVersion: v1.4.4
PackageSummary: golang-mock
PackageDescription: GoMock is a mocking framework for the Go programming language.
PackageHomePage: https://github.com/golang/mock
ExternalRef: PACKAGE-MANAGER purl pkg:golang/github.com/golang/[email protected]
PackageDownloadLocation: NOASSERTION
PackageLicenseConcluded: Apache-2.0
PackageLicenseDeclared: NOASSERTION
FilesAnalyzed: false
PackageCopyrightText: NOASSERTION
...