VariantContextConverter never returns DatabaseVariantAnnotation

[akmorrow13]

in VariantContextConverter function convert line 184:
def convert(vc: HtsjdkVariantContext): Seq[ADAMVariantContext]

always creates ADAMVariantContext without a DatabaseVariantAnnotation, even in the 1000genomes files with alleleFrequency fields.

[fnothaft]

That's going to be patched by #1078. If you need this right now with the ADAM 0.19.0 DatabaseVariantAnnotation schema, you may want to use some derivative upon bigdatagenomics/quinine@a5cb6b0. I'm going to close this as a dupe for now, but please reopen this if you think it should fall outside of #1078.