packages - increase curl timeout for remote file exists check to 10 seconds

Some users reported issues and it was taking between 5 and 6 seconds - which points to an connectivity issue
really, as it's a small HEAD request. However increasing the timeout will help for these users.

This is a quick fix, as I will look into improving the error msgs also.

Author: joolswills

scriptmodules/packages.sh

@@ -424,7 +424,7 @@ function rp_getBinaryUrl() {
 function rp_remoteFileExists() {
     local url="$1"
     local ret
-    curl --max-time 5 -o /dev/null -sfI "$url"
+    curl --max-time 10 -o /dev/null -sfI "$url"
     ret="$?"
     if [[ "$ret" -eq 0 ]]; then
         return 0