Fix server/ui/V4Pages test

Commit cc9b7c4 changed redirect URL to
be relative. However, it did not update the corresponding redirect tests
due to them passing because of the cPerf issue fixed in
f98bc1b. These tests are now failing.
This commit fixes them.

Reviewed By: cmatthews

Differential Revision: https://reviews.llvm.org/D94635

Author: Thomas Preud'homme

tests/server/ui/V4Pages.py

@@ -577,9 +577,9 @@ def main():
 
     # Check the compare machine form gives correct redirects.
     resp = check_code(client, '/v4/nts/machine/2/compare?compare_to_id=3', expected_code=HTTP_REDIRECT)
-    assert resp.headers['Location'] == "http://localhost/db_default/v4/nts/9?compare_to=4"
+    assert resp.headers['Location'] == "/db_default/v4/nts/9?compare_to=4"
     resp = check_code(client, '/v4/nts/machine/3/compare?compare_to_id=2', expected_code=HTTP_REDIRECT)
-    assert resp.headers['Location'] == "http://localhost/db_default/v4/nts/4?compare_to=9"
+    assert resp.headers['Location'] == "/db_default/v4/nts/4?compare_to=9"
 
     # Get the order summary page.
     check_html(client, '/v4/compile/all_orders')
@@ -666,8 +666,8 @@ def main():
     graph_to_sample = check_code(client, '/db_default/v4/nts/graph_for_sample/10/compile_time?foo=bar',
                                  expected_code=HTTP_REDIRECT)
     assert graph_to_sample.headers['Location'] in (
-            "http://localhost/db_default/v4/nts/graph?foo=bar&plot.0=2.6.0",
-            "http://localhost/db_default/v4/nts/graph?plot.0=2.6.0&foo=bar")
+            "/db_default/v4/nts/graph?foo=bar&plot.0=2.6.0",
+            "/db_default/v4/nts/graph?plot.0=2.6.0&foo=bar")
 
     # Check that is we ask for a sample or invalid field, we explode with 400s.
     check_code(client, '/db_default/v4/nts/graph_for_sample/10000/compile_time?foo=bar',