Tolerate vcl.show error 201 (response truncated)

Fixes #104

systemd/varnishreload

@@ -112,15 +112,23 @@ find_label_ref() {
 }
 
 find_vcl_file() {
-	VCL_SHOW=$(varnishadm vcl.show -v "$VCL_NAME") ||
-	fail "failed to get the VCL file name"
-
-	echo "$VCL_SHOW" |
-	awk '$1 == "//" && $2 == "VCL.SHOW" {print; exit}' | {
-		# all this ceremony to handle blanks in FILE
-		read -r DELIM VCL_SHOW INDEX SIZE FILE
-		echo "$FILE"
-	}
+	VCL_SHOW=$(varnishadm vcl.show -v "$VCL_NAME" 2>&1) || :
+	VCL_FILE=$(
+		echo "$VCL_SHOW" |
+		awk '$1 == "//" && $2 == "VCL.SHOW" {print; exit}' | {
+			# all this ceremony to handle blanks in FILE
+			read -r DELIM VCL_SHOW INDEX SIZE FILE
+			echo "$FILE"
+		}
+	) || :
+
+	if [ -z "$VCL_FILE" ]
+	then
+		echo "$VCL_SHOW" >&2
+		fail "failed to get the VCL file name"
+	fi
+
+	echo "$VCL_FILE"
 }
 
 find_vcl_reloads() {