add TRACI support for Junction geometry

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@14935 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
failing tests for #1055

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@14936 29f149b2-0c63-11e1-8f5c-a347f6a9acd0