Use 'exclude_daemons' option for master only

Use 'exclude_daemons' option for master only

During 'gnt-cluster renew-crypto --new-cluster-certificate'
or '... --new-node-certficates' all daemons are shutdown,
except for wconfd and noded. So far, noded was not shutdown
on all nodes, although it is only necessary on the master.
This patch makes sure that the 'exclude_daemons' flag only
applies to the master, as all interesting operations will
only need them there.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>