215343 : Unable to obtain index from central (mirror)

Description: http://netbeans.org/bugzilla/show_bug.cgi?id=215343

The server settings on central maven repository have changed and most
likely all requests coming from clients without a User-Agent are
blocked now.
Was most likely done during the last week or so.
The fix is to include a User-Agent header entry when retrieving the index files.

Impact assessment: High: many maven related features will be impacted

Risk assessment: High:

The fix has been tested by qe.

Changesets:
https://hg.netbeans.org/core-main/rev/1aa01e27dd62
https://hg.netbeans.org/core-main/rev/851eee396848

Thank you

Milos Kleint