Enables saml setting to be overridden

[KhizerJaan]

Summary

Previously , saml settings were not configured to be overridden , it would enable saml settings to be overridden.

Ticket Link

Fixes https://github.com/mattermost/mattermost-server/issues/382

[mattermod]

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[KhizerJaan]

/check-cla

[mattermod]

This PR has been automatically labelled "stale" because it hasn't had recent activity. A core team member will check in on the status of the PR to help with questions. Thank you for your contribution!

[erezo9]

@KhizerJaan the config.tpl doesnt apply to the deployment unless you add the config into a volumemount and volume since its a Kubernetes installation, the configuration is stored in the database and the whole point of the config file is irrelavent

if you see in the code you can see the config map is only applied to the load test and not the application it self hope this helps