Make all zuul-web urls relative

Currently some static files are retrieved with relative and some with
absolute paths. This requires hacks (e.g. ProxyHTMLURLMap) if zuul
runs under a sub url and makes url rewriting much harder. Switch them
all to relative paths.

Change-Id: I3350faf760af7b5bd92dbc344a1110dde3a35863
4 files changed