Move test repository with Features inside our codebase

[elgris]

User story

As a developer I want to be able to run tests for Git storage connector locally with no external dependencies

Acceptance criteria

• Test features moved to https://github.com/Sangdol/pazuzu-test-repo to storageconnector/fixtures/git
• Tests for Git storage connector are wired to local fixtures

[stoewer]

Resolved via #74