validator should not warn "Unnamed junction" for junction=roundabout

[Klumbumbus]

The wiki says: "A roundabout should only be tagged with name=* if the junction itself is named independently and differently from the roads crossing it. "

So the validator should not warn about roundabouts without name=*

(If there is ref=* on the roundabout, the warning disappears, but ref is also not a obligatory tag for roundabouts.)

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2015-01-19 02:35:00
Last Changed Author: Klumbumbus
Revision: 7972
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2015-01-19 02:48:18 +0100 (Mon, 19 Jan 2015)
Last Changed Rev: 7972

Identification: JOSM/1.5 (7972 en) Windows 7 32-Bit
Memory Usage: 385 MB / 742 MB (97 MB allocated, but free)
Java version: 1.7.0_71, Oracle Corporation, Java HotSpot(TM) Client VM
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:C:\Program Files\Java\jre7\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=C:\Program Files\josm-latest.jnlp, -Djnlpx.remove=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.heapsize=256m,768m, -Djnlpx.splashport=57693, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAA==]
Dataset consistency test: No problems found

Plugins:
- DirectUpload (30892)
- HouseNumberTaggingTool (30892)
- OpeningHoursEditor (30892)
- PicLayer (30892)
- Tracer2 (30892)
- buildings_tools (30892)
- download_along (30892)
- editgpx (30892)
- imagery_offset_db (30892)
- measurement (30892)
- mirrored_download (30892)
- notes (v0.9.5)
- public_transport (30892)
- reltoolbox (30892)
- reverter (30892)
- tag2link (30892)
- terracer (30892)
- turnrestrictions (30892)
- undelete (30892)
- utilsplugin2 (30892)
- wikipedia (30892)

Last errors/warnings:
- E: Failed to locate image 'error_small.png'
- W: Mappaint style "standard" (FIXME Highlight Warnings) icon "error_small.png" not found.

[Don-vip]

In 7981/josm:

fix #10995 - lower "Unnamed junction" warning to info level