The current workflow for gnocchi/ceilometer upgrade doesn't
work well with swift backend.
Notification agent push data into Gnocchi on step4, but
Ceilometer-upgrade run only on step5, So Gnocchi have not been populated
with latest resource schemas.
Gnocchi-api is started in step3 but gnocchi::storage configuration have
not been done and database upgrade have not been done.
When configuration is done on step4, httpd will be restarted.
This change will fix this issue by:
* Doing only the Gnocchi database upgrade on step3 because swift is
ready only on step4.
* Configuring gnocchi::storage on step3 to avoid gnocchi-api restart on
step4.
* Add dependencies between ceilometer-upgrade and gnocchi-api in case of
non multinode deployment.
This ensures:
* gnocchi-api will be correctly configured at the end of
step3 (configuration+database-sync).
* No new measures will be pushed to Gnocchi before ceilometer-upgrade have
upgraded the Gnocchi resource schemas.
* Gnocchi-api have database updated before ceilometer-upgrade need it.
* We continue to upgrade storage/incoming data of Gnocchi on step4 after
swift is up.
Closes-bug: #1724328
Change-Id: I3f9a784e507e03454b335ba8319601fba208ba0a
5b1a139fa0