ns_server crash because linux can run out of open fil descriptors if user defines more than 10 views for one bucket

saw this during testing.

[error_logger:error] [2011-12-07 9:19:40] [ns_1@127.0.0.1:error_logger:ale_error_logger_handler:log_msg:76] ** Generic server mb_mnesia terminating

• • Last message in was {mnesia_system_event,
    {mnesia_fatal,"Cannot open log file ~p: ~p~n",
    ["/opt/couchbase/var/lib/couchbase/mnesia/PREVIOUS.LOG",
    {file_error, "/opt/couchbase/var/lib/couchbase/mnesia/PREVIOUS.LOG", system_limit}

    ],
    <<131,108,0,0,0,24,104,2,100,0,9,99,114,97,
    115,104,105,110,102,111,104,2,107,0,29,67,
    97,110,110,111,116,32,111,112,101,110,32,
    108,111,103,32,102,105,108,101,32,126,112,
    58,32,126,112,126,110,108,0,0,0,2,107,0,52,

will have to repro and gather more information.