[ADAM-1806] Add toVariants conversion from GenotypeRDD.

[fnothaft]

Resolves #1806.

[fnothaft]

Just realized, this needs to propagate through to R/Python as well.

[heuermh]

Just realized, this needs to propagate through to R/Python as well.

Yep, at least we haven't spread ourselves too thin. ;)

[coveralls]

Coverage decreased (-0.03%) to 82.53% when pulling dc6f761 on fnothaft:issues/1806-genotypes-to-variants into aa43a56 on bigdatagenomics:master.

[coveralls]

Coverage decreased (-0.03%) to 82.53% when pulling dc6f761 on fnothaft:issues/1806-genotypes-to-variants into aa43a56 on bigdatagenomics:master.

[coveralls]

Coverage decreased (-0.03%) to 82.53% when pulling dc6f761 on fnothaft:issues/1806-genotypes-to-variants into aa43a56 on bigdatagenomics:master.

[coveralls]

Coverage increased (+0.1%) to 82.691% when pulling 3a1b677 on fnothaft:issues/1806-genotypes-to-variants into c691356 on bigdatagenomics:master.

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/ADAM-prb/2644/
Test PASSed.

[fnothaft]

This is good to go from my side now.

[heuermh]

Doc comment needs deduplicating.

[fnothaft]

Ironic!

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/ADAM-prb/2658/
Test PASSed.

[fnothaft]

Addressed reviewer comments.

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/ADAM-prb/2686/
Test PASSed.

[heuermh]

Thank you, @fnothaft