unzip -> 7z for GRCh37 dbnsfp
unzip -> 7z for GRCh37 dbnsfp

bcbio/bcbio-nextgen#3440 suggested the fix. Thanks to @pfpjs for the
suggestion to update this for GRCh37 as well. hg19 was already all set.

29560397a918f0795b2254656cd20fdd87da8469 has the suggestion from @pfpjs.
Thank you!

chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux