drbd: move global variables to drbd namespace and make some static
This is a follow-up to Gregs complaints that drbd clutteres the global namespace. Some of DRBD's module parameters are only used within one compilation unit. Make these static. Signed-off-by: NRoland Kammerer <roland.kammerer@linbit.com> Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com> Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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