spec: Don't depend on subscriptions on CentOS
spec: Don't depend on subscriptions on CentOS

subscription-manager is a RHEL only thing. Thus cockpit-subscriptions
should only be a default dependency of cockpit on RHEL.

Closes #1937
Signed-off-by: Fabian Deutsch <de69c509e52dfe544d526a81279fe21e1252748c@fedoraproject.org>
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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