Remove unused file

doc/common/wadl/security-groups.wadl is not used at all,
remove it.

Change-Id: I34dad19dad4f9c0250bb4878da18572748d2555b
Publish training-guides at /training-guides

Publish at /training-guides instead of at /trunk/training-guides.
Add redirects to new location.

Change-Id: Ifad5c1cb77113d542ae82df83e5d9e77469a90db
Merge "Remove unused file"
Merge "Publish training-guides at /training-guides"