Bug 872: Drop messages (and log) if stats collector gets behind.
Bug 872: Drop messages (and log) if stats collector gets behind.

Signed-off-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>

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