[Doc'd] many concurrent view requests cause excessive resource consumption and even crash

In response to many view requests against the scatter/gather view merger, a node can allocate so many resources that it will fail to recover.

In one case, this did cause many timeouts in the log leading to max_restart_intensity:
[error_logger:error,2013-04-25T15:23:26.047,ns_1@10.128.16.171:error_logger<0.6.0>:ale_error_logger_handler:log_report:72]
=========================SUPERVISOR REPORT=========================
Supervisor:

{local,ns_node_disco_sup}

Context: shutdown
Reason: reached_max_restart_intensity
Offender: [

{pid,<0.17237.774>}

,

{name,ns_config_rep}

,
{mfargs,{ns_config_rep,start_link,[]}},

{restart_type,permanent}

,

{shutdown,1000}

,

{child_type,worker}

]