rm v2 directory interfaces

[gertd]

Remove v2 directory support from go-edge-ds, v2 was already disabled per topaz v0.32.0, this PR removes the code.

[coveralls]

Pull Request Test Coverage Report for Build 9467371676

Details

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• 139 unchanged lines in 10 files lost coverage.
• Overall coverage decreased (-2.0%) to 25.468%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/directory/v3/reader.go	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/directory/directory.go	1	70.23%
pkg/bdb/migrate/mig/mig.go	2	27.37%
pkg/bdb/boltdb.go	5	53.85%
pkg/bdb/metadata.go	5	69.57%
pkg/ds/object.go	6	53.85%
pkg/bdb/scanner.go	8	34.31%
pkg/bdb/generic.go	8	38.1%
pkg/ds/relation.go	15	56.05%
pkg/directory/v3/writer.go	40	30.11%
pkg/directory/v3/reader.go	49	13.55%

Totals
Change from base Build 9277923225:	-2.0%
Covered Lines:	857
Relevant Lines:	3365

---

💛 - Coveralls

[carabasdaniel]

Is there a reason to keep the commented out tests ?

[gertd]

@carabasdaniel Thanks for the review, the commented out test I will remove, these should indeed not be there