SOL003/VNFPackageArtifacts/2.6.1 Range is kept all along the test cases

The first range test case fail for a strange reason : GET Individual VNF Package Artifact with Range Request and NFVO supporting Range Requests bytes 0-1023/22872 != bytes=0-1023/22872

But after that point range is used in : Individual VNF Package Artifact with Range Request and NFVO not supporting Range Requests

Then bad range is set, and used for all other test cases.