Pingback discovery doesn't strip fragment identifiers from URL

[solarissmoke]

To reproduce:

1. Insert a link containing a fragment identifier into a post, e.g., http://localhost/wp/helloworld/#comments.
2. Save post.
3. Observe the URL which WordPress attempts to retrieve in discover_pingback_server_uri() - the requested path contains the #fragment_identifier, which it shouldn't, and in most cases will result in a 404, thus the pingback fails.

[kurtpayne]

This happens for enclosures, too. Those URLs should not be changed, right?