Remove obsolete Nova stats alerts

Remove monitoring from map.jinja
Now all alerts should be tuned in the same way,
through pillar for prometheus:server

Change-Id: Iea1535c12fe2c1005740719fed0cbb4ce182c27f
Closes-Bug: PROD-27366 (PROD:27366)
PROD-Related: PROD-27670 (PROD:27670)
(cherry picked from commit 2ca2d673d0c5553bfb0eef4b8fb2be06a19b6822)
2 files changed