Disable automatic preparation of offline distro

With this commit we disable the automatic invocation of the script that
creates the Rally offline distribution. We disable it because the new
pypi API caches quite heavily and the Rally package will not show up
immediately after the release. Therefore, creating this distribution is
an additional manual step in the release process for the time being.

release.sh

@@ -66,7 +66,7 @@ git commit -a -m "Continue in $NEXT_RELEASE"
 git push origin master
 
 # Prepare offline installation package
-source scripts/offline-install.sh "${RELEASE_VERSION}"
+# source scripts/offline-install.sh "${RELEASE_VERSION}"
 
 echo ""
 echo "===================="