Fix unbind_job make target
Fix unbind_job make target

at some point, in_parallel added an extra key
'steps'. When doing the recursive remove_passed(),
include this.

[skip ci]

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf