v7 signing tasks no longer need certificate locations
v7 signing tasks no longer need certificate locations

[#168016331]

Co-authored-by: Brendan Smith <8591d66a77fc00d117843ef4d4bc1fbb80fd377f@pivotal.io>
Co-authored-by: Belinda Liu <496afffef642eb3807bf00ef2898c80e8c6b937c@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli