Reinstate '-T delay' support
The following discussion from !8751 (merged) should be addressed:
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@marka started a discussion: (+3 comments) I wouldn't remove this. It needs to be reinstated at some point.
bin/tests/system/pipelined/ns3/named.args:-m record,size,mctx -c named.conf -d 99 -D pipelined-ns3 -X named.lock -g -T delay=200