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[ci] use alternate bash comparison

The pattern `echo str | grep -qE pattern` likes to fail on the z CI here for
an unknown reason. Use `grep -qE pattern <<< str` instead.

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>

Christopher Jones authored on 2018/01/13 01:05:20
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@@ -63,7 +63,7 @@ fetch_blob() {
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 			-D-
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 	)"
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 	curlHeaders="$(echo "$curlHeaders" | tr -d '\r')"
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-	if echo "$curlHeaders" | grep -qE "^HTTP/[0-9].[0-9] 3"; then
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+	if grep -qE "^HTTP/[0-9].[0-9] 3" <<<"$curlHeaders"; then
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 		rm -f "$targetFile"
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 		local blobRedirect="$(echo "$curlHeaders" | awk -F ': ' 'tolower($1) == "location" { print $2; exit }')"