Make use of the Capability pollInterval

[dragotin]

The server capability contains an entry called pollInterval since ages. It is just not read by the clients yet.

It could be used to steer the clients poll interval, ie. the interval how often a client checks for changes on the server. Admins could just set the value to a different than the default of 30 seconds to manage their resources.

Note: The upload of data from the client is not affected by this poll interval at all, it is always starting right after the local change happened.

Expected Behaviour:

• As an admin I can set the remote poll interval of clients different from the default of 30 seconds.
• As a user on the desktop I still can overwrite that value in my local config.
• As ownCloud we do not want to change the default behaviour.

[dragotin]

See #8777 for a patch implementing that.

[github-actions]

This issue was marked stale because it has been open for 30 days with no activity. Remove the stale label or comment or this will be closed in 7 days.