check_netscaler_cpu

Graphing/performance data was missing from the script, I've added it.

Add

my $metric = "|cpu_use=".$cpu_usage."%;$o_warning;$o_critical;";

after the following line (line 99 I think):

$return_str= "CPU Usage $cpu_usage % :";

And then change:
print $return_str,$state,"n";

to

print $return_str,$state,$metric,"n";

And Nagios will get performance data which can then be graphed.

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The OID I'm seeing people check for CPU (and can confirm works) is 1.3.6.1.4.1.5951.4.1.1.41.1.0

Line 50 of the script as it is today, 20140702. Starting "my $oid_cpu_usage ="

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