bug fix: display kimchi icon instead of cherrypy icon

When we start a VNC window, the favicon.ico is always cherrypy icon.

Actually we open any page:
such as:
http://192.168.1.117:8000/error

the favicon.ico is also a cherrypy icon.

This patch fix this bug.

Ref:
http://docs.cherrypy.org/en/latest/progguide/files/favicon.html

Signed-off-by: ShaoHe Feng <shaohef@linux.vnet.ibm.com>