it had been renamed to resolve=DEEP

Ref ddf2b04a

This is useful for VCL simplification

Ref: https://github.com/varnishcache/varnish-cache/pull/2680

ref: 0c74d1b99f1f43fc99725fe14322760afa7858ee

When cluster_task_param_l as called with black==0, we would
fail to alloc enough space for the existing blacklist, so
the blacklist would get overwritten by the next allocation
on the workspace