Shorten the prefix text, for shorter varnishtest log output.

src/tests/prefix.vtc

@@ -1146,110 +1146,6 @@ client c1 {
 	expect resp.http.Which-Last == "0"
 	expect resp.http.Which-Shortest == "0"
 	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: kuz9eiXaew"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: fo2leShohj"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: thooL5peu4"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: aifaeW5dae"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: Aifiehoz3m"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: ahg1Va1hee"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: sowoh6saiX"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
-
-	txreq -hdr "Word: phahc0la8A"
-	rxresp
-	expect resp.status == 200
-	expect resp.http.Match == "false"
-	expect resp.http.N == "0"
-	expect resp.http.Which == "0"
-	expect resp.http.Which-Unique == resp.http.Which
-	expect resp.http.Which-Exact == "0"
-	expect resp.http.Which-First == "0"
-	expect resp.http.Which-Last == "0"
-	expect resp.http.Which-Shortest == "0"
-	expect resp.http.Which-Longest == "0"
 } -run
 
 varnish v1 -vcl {