[landscape] Substitute oidc conf in service file

[slashdd]

Substitute sensitive informations about oidc
found in landscape service configuration file.

From release 19.10, Landscape can use OpenID-Connect
(OIDC) to authenticate users. To enable OpenID-Connect
support, please add oidc-issuer, oidc-client-id and
oidc-client-secret to /etc/landscape/service.conf in
the [landscape] section.

Reference:
https://docs.ubuntu.com/landscape/en/onprem-auth#openid-connect-support

Resolves: #2023

Signed-off-by: Eric Desrochers eric.desrochers@canonical.com

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[TurboTurtle]

LGTM. Merging shortly.

[TurboTurtle]

Closed via 6bb699d - timing of the push hit during a GH outage which prevented the auto close triggers from firing.