Set disksup check interval to 1 minute.
Set disksup check interval to 1 minute.

This made the "line of death," not to mention free space, only update
once every 30 minutes, since that's the default check interval.

Change-Id: I15cd757b2cf5743bb830481ff6c8308b96769338
Reviewed-on: http://review.membase.org/4120
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

t3rm1n4l/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,ceejatec/ns_server,daverigby/ns_server,membase/ns_server,vzasade/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,nimishzynga/ns_server,vzasade/ns_server,daverigby/ns_server,ceejatec/ns_server,pavel-blagodov/ns_server,nimishzynga/ns_server,ceejatec/ns_server,membase/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,ceejatec/ns_server,membase/ns_server,nimishzynga/ns_server,daverigby/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,membase/ns_server,membase/ns_server,vzasade/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,vzasade/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,mschoch/ns_server,mschoch/ns_server,ceejatec/ns_server,nimishzynga/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,membase/ns_server