Add SAMPLEGENO

This step is for portal compatibility, and can be skipped for non-portal use cases. The tag SAMPLEGENO is added by samplegeno.py script (https://github.com/dbmi-bgm/cgap-scripts) to the INFO field of the vcf file.

• CWL: samplegeno.cwl

##INFO=<ID=SAMPLEGENO,Number=.,Type=String,Description="Sample genotype information. Subembedded:'samplegeno':Format:'NUMGT|GT|AD|SAMPLEID'">

The tag is used to store the original information about genotypes and allelic depth (AD) before splitting multi-allelic to bi-allelic variants. It also offers a unique place for accessing the genotype and AD information of all the samples.