Using absolute path in error page

Error page will be returned for URI deeper than one layer of directory,
such as: http://localhost:8000/d1/d2/non-existent-page.html
Using relative path will result in img and css not found.
Change reference to be absolute path.

Signed-off-by: Bing Bu Cao <mars@linux.vnet.ibm.com>
Signed-off-by: Royce Lv <lvroyce@linux.vnet.ibm.com>
python2.6 do not support dict key iteration

python2.6 do not support dict key iteration

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