centralize cleanup after fetch errors
imples the following changes: * VDI_Finish() is now always conditional on bo->director_state != DIR_S_NULL, making it idempotent * introduces additional calls to VFP_Close() from startfetch and for the filter_list / VCL_StackVFP error in vbf_stp_fetch(), but VFP_Close() is idempotent. * adds VFP_Close() for VFP_Open() failure in vbf_stp_fetch() which I think is actually missing (for the case that some VFPs could get opened before the open failure) * calls VDI_Finish() earlier in vbf_stp_fetchend: I checked the code and can not see any issue with this. motivated by #3009 Conflicts: bin/varnishd/cache/cache_fetch.c
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