in CreateVariantIngestFiles, set default drop_state to 60, but allow NONE as input

[mmorgantaylor]

• updated integration test (removed that argument so it defaults to the same thing)
• tested that using "NONE" as an argument works

[kcibul]

lgtm -- except for making me remember how the 'GQ > x' was implemented due to the enum... backing away slowly

[mmorgantaylor]

lgtm -- except for making me remember how the 'GQ > x' was implemented due to the enum... backing away slowly

yeah that's pretty gross. didn't want to touch it with a ten-foot pole -- but i looked through and checked that the logic will work as intended if you use "NONE" (it just adds nothing to the set of states to ignore)