Upload script: tweak to overwrite existing files

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1527500 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/tooling/ide/upload-p2-site.sh b/tooling/ide/upload-p2-site.sh
index 76a051f..f4eeaf6 100644
--- a/tooling/ide/upload-p2-site.sh
+++ b/tooling/ide/upload-p2-site.sh
@@ -12,4 +12,4 @@
 scp p2update/target/*.zip people.apache.org:$SITE_LOCATION
 
 # 4. Unzip the new update site
-ssh people.apache.org "cd $SITE_LOCATION && unzip *.zip && rm -f *.zip"
+ssh people.apache.org "cd $SITE_LOCATION && unzip -o *.zip && rm -f *.zip"