Description of problem:
When mounted somewhere other than "/", the login UI prepends the context path
twice, causing links to point to invalid locations.

Version-Release number of selected component (if applicable):
5.3.0.AUTO.02.18.2003

How reproducible:
Reproducible

Steps to Reproduce:
1. Mount CCM at "/ccm"
2. Set context path to "/ccm", and servlet path to "" in enterprise.init
3. Load "<hostname>/ccm/" in a browser.  The site should redirect to /ccm/register.
4. Click on any link on the page.
    
Actual results:
The selected link will be to "/ccm/ccm/wherever"

Expected results:
The link should point to "/ccm/wherever"

Additional info:
bebop.Link prepends the DispatcherPath to any absolute location
(bebop/Link.java:251).  The admin UI creates links with absolute paths to the
site root, not the context root, by calling Initializer.getFullURL(), which
prepends SiteNode.getRootSiteNode().getURL(req). 
(kernel/security/Initializer.java:303,313)  Replacing getRootURL(req) in
getFullURL() (kernel/security/Initializer.java:303) with "/" seems to solve the
problem.