Change host selecting for Neutron dashboards

Exclude compute and gateway hosts
as they run neutron servies other than API.
Compute and gateway services metrics
are not filtered by host in dashboards.

Related-bug: PROD-26252 (PROD:26252)
(cherry-picked from commit 657722f6d33aec1f96d8e7690ebf232bf3b4f768)

Change-Id: Ib3496de99eedba21f7694b515faffa72420ecc1b
2 files changed