SCRIPTS: create-release: show the correct origin name in suggested commands

create-release shows the next steps at the end and suggest to use
"git push origin master" but on my machine it's not "origin" so let's
determine it using git config and only use origin as a fall back.

(cherry picked from commit ff0c8424c87f1d702d98cdb593e6b701c7e61b15)
Signed-off-by: Willy Tarreau <w@1wt.eu>
diff --git a/scripts/create-release b/scripts/create-release
index 4eb1fc1..fe6c802 100755
--- a/scripts/create-release
+++ b/scripts/create-release
@@ -225,8 +225,9 @@
 do_commit || die "Failed to commit changes"
 do_tag    || die "Failed to tag changes"
 
+remote=$(git config --get branch.master.remote)
 echo "Do not forget to push updates, publish and announce this version :"
 echo
-echo "git push origin master v$NEW"
+echo "git push ${remote:-origin} master v$NEW"
 echo "${0%/*}/publish-release"
 echo "${0%/*}/announce-release"