Commits on Jul 4, 2014

1. Removing plugin does not fail when plugin dir is read only …

   If you try to remove a plugin in read only dir, you get a successful result:
   
   ```
   $ bin/plugin --remove marvel
   -> Removing marvel
   Removed marvel
   ```
   
   But actually the plugin has not been removed.
   
   When installing, if fails properly:
   
   ```
   $ bin/plugin -i elasticsearch/marvel/latest
   -> Installing elasticsearch/marvel/latest...
   
   Failed to install elasticsearch/marvel/latest, reason: plugin directory /usr/local/elasticsearch/plugins is read only
   ```
   
   This change throw an exception when we don't succeed removing the plugin.
   
   Closes elastic#6546.

   

   dadoonet committed Jul 4, 2014
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