Add support for counting Linux Process types

Uses ps to count the amount of processes on a system. I've placed this
into the Linux area as I've only tested it on a Linux system (Ubuntu
11.04).

lib/Core/Linux/Processes.pm

+package Core::Linux::Processes;
+
+use strict;
+use warnings;
+
+use base 'Resmon::Module';
+
+use Resmon::ExtComm qw(run_command cache_command);
+
+=pod
+
+=head1 NAME
+
+Core::Linux::Processes - a procesess state module
+
+=head1 SYNOPSIS
+
+ Core::Linux::Processes {
+     local : noop
+ }
+
+=head1 DESCRIPTION
+
+This module returns information on the state of the proceses on a running system.
+
+=head1 CONFIGURATION
+
+=over
+
+=item check_name
+
+The check name is descriptive only in this check. It is not used for anything.
+
+=back
+
+=head1 METRICS
+
+=over
+
+=item blocked
+
+Processes in an uninterruptible sleep.
+
+=item zombies
+
+Defunct processes, terminated but not reaped by their parent.
+
+=item running
+
+Running or runnable processes.
+
+=item sleeping
+
+Processes in an interruptible sleep.
+
+=item stopped
+
+Stopped processes.
+
+=back
+
+=cut
+
+sub handler {
+    my $self = shift;
+    my $config = $self->{config}; # All configuration is in here
+    my $check_name = $self->{check_name}; # The check name is in here
+
+
+    my $ps_cmd = 'ps ax -o state';
+
+    my $processes = run_command($ps_cmd);
+    my @processes = split(/\n/, $processes);
+
+    my $sleeping = grep(/S/, @processes);
+    my $blocked = grep(/D/, @processes);
+    my $zombies = grep(/Z/, @processes);
+    my $running = grep(/R/, @processes);
+    my $stopped = grep(/T/, @processes);
+
+    return {
+        "blocked" => [$blocked, "i"],
+        "zombies" => [$zombies, "i"],
+        "running" => [$running, "i"],
+        "stopped" => [$stopped, "i"],
+        "sleeping" => [$sleeping, "i"]
+    };
+};
+
+1;