removing unecessary test dependencies (#4315)
removing unecessary test dependencies (#4315)

removing hamcrest and junit test dependencies
these were necessary for dataflow tests but are no longer used
ksthesis/gatk,ksthesis/gatk,broadinstitute/hellbender,magicDGS/gatk,broadinstitute/hellbender,broadinstitute/hellbender,frank-y-liu/gatk,ksthesis/gatk,frank-y-liu/gatk,magicDGS/gatk,frank-y-liu/gatk,broadinstitute/hellbender,magicDGS/gatk,ksthesis/gatk,frank-y-liu/gatk,ksthesis/gatk,ksthesis/gatk,broadinstitute/hellbender,broadinstitute/hellbender,magicDGS/gatk,magicDGS/gatk,magicDGS/gatk,frank-y-liu/gatk,frank-y-liu/gatk