feat(reva): Pass the multi-tenancy flag to reva services

This allows to pass the multi-tenant enablement flag as a shared config
option to the reva service. This needs to be done for all reva services
since it ends up in a global variable in reva that is only initialized
once, by the service that is the first to parse its config.
See https://github.com/opencloud-eu/opencloud/issues/1563 for details.
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