Update the large CRAM files to v3.0.

[cmnbroad]

This PR adds a CRAM v3.0 version of the existing (CRAM v2.1) test file CEUTrio.HiSeq.WGS.b37.NA12878.20.21.cram in git-lfs and in the cloud test resources bucket. In both cases, the old files are left intact for now. Roundtrip tests using both the old and new versions of the local file are also added.

At some point, the old files can be removed, but when we do so, old branches will need to be rebased on this code or the cloud tests will fail, since the cloud test in this PR uses the new file name (that includes the CRAM version in the name).