Update sitemap.xml

Update so that links for Operations Guide are correct after the move
from /trunk/openstack-ops to /openstack-ops.
This is generated using the patch in
https://review.openstack.org/#/c/103058/ and thus does not include any
/trunk/ links at all.

Change-Id: I4e1fec6f9306f4ecf3455b4245ba7ff28ced6914
Merge "Update sitemap.xml"