When the app is mounted at /bkr tests fail like this:

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ERROR: test_add_system_group_admin_privs (bkr.inttest.server.selenium.test_system_groups.TestSystemGroups)
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Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/bkr/inttest/server/selenium/test_system_groups.py", line 69, in test_add_system_group_admin_privs
    WebDriverWait(b, 5).until(lambda driver: 'Yes' in driver.find_element_by_xpath('//span[@id="admin_group_%s"]' % self.group.group_id).text)
  File "/usr/lib64/python2.6/site-packages/selenium/webdriver/support/wait.py", line 56, in until
    raise TimeoutException()
TimeoutException: Message: None 

======================================================================
ERROR: test_remove_system_group_admin_privs (bkr.inttest.server.selenium.test_system_groups.TestSystemGroups)
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Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/bkr/inttest/server/selenium/test_system_groups.py", line 51, in test_remove_system_group_admin_privs
    b.find_element_by_link_text('(Remove)').click()
  File "/usr/lib64/python2.6/site-packages/selenium/webdriver/remote/webdriver.py", line 234, in find_element_by_link_text
    return self.find_element(by=By.LINK_TEXT, value=link_text)
  File "/usr/lib64/python2.6/site-packages/selenium/webdriver/remote/webdriver.py", line 645, in find_element
    {'using': by, 'value': value})['value']
  File "/usr/lib64/python2.6/site-packages/selenium/webdriver/remote/webdriver.py", line 153, in execute
    self.error_handler.check_response(response)
  File "/usr/lib64/python2.6/site-packages/selenium/webdriver/remote/errorhandler.py", line 147, in check_response
    raise exception_class(message, screen, stacktrace)
NoSuchElementException: Message: u'Unable to locate element: {"method":"link text","selector":"(Remove)"}' 

because system_admin.js is pointing at /change_system_admin when it should be /bkr/change_system_admin. We need to tg.url() it somehow.