curl: Add retries

Change default 0 retries to 5, that should help for transient
errors (timeouts, HTTP 408, 429, 500, 502, 503 or 504).

Change-Id: Iad3c7270579ffb38299269481ac64d5582abaa22

docker/base/curlrc

@@ -1,6 +1,7 @@
 # curl default options
 --fail
 --location
+--retry 5
 --silent
 --show-error
 --write-out "curl (%{url_effective}): response: %{http_code}, time: %{time_total}, size: %{size_download}\n"

releasenotes/notes/curl-retries-e1c5d6b5b25d7380.yaml

@@ -0,0 +1,4 @@
+---
+other:
+  - |
+    Added '--retry 5' to curlrc to improve curl downloads during image builds.