Ant task fails to extract certificate from jar signed as BLOB and therefore result JNLP file does not have cached certificate.

This make it really hard to use new way of signing we added in JavaFX with cached certificate functionality.

Another minor problem - default value of "elevated" attribute was set to be "false" during renaming in b41.
This is inconvenient as users need to write more code to sign app and getting permissions without signing is not possible anyways.
This will not impact any tests as only couple of tests in the workspace exercise this functionality and they actually fail currently
as none of them set elevated to true explicitly.