Siemens HiPath 3000 Series check

This plugin checks the following via SNMP:
* the overall system state
* state of every installed extension card
* load level
* uptime

The first two checks alter the check's result code, 3rd may optionaly alter it too. Uptime is just informational.

Some examples:

-- without parameters usage is printed and UNKNOWN status returned
[root@nagios libexec]# ./check_siemens_hipath
Usage: check_siemens_hipath -H hostname_or_ip-address [-C community] [-w load -c load]
Usage: check_siemens_hipath -V|--version
Usage: check_siemens_hipath --help

-- if no community is given, "public" is assumed
[root@nagios libexec]# ./check_siemens_hipath --host checked.systems.ip.address -w 10 -c 20
OK - Overall system state(normal); All 12 expansion cards(normal); CPU Load 0% (w/c 10%/20%); Uptime: 62:9:51:35.45

-- if -w and/or -c is ommited or if -c is lower than -w - load level is only informational (no nagios state change)
[root@nagios libexec]# ./check_siemens_hipath -H checked.systems.ip.address
OK - Overall system state(normal); All 12 expansion cards(normal); CPU Load 0%; Uptime: 62:10:08:26.67

-- "warning" and "minor" state is mapped to WARNING, "major" and "critical" is mapped to CRITICAL
[root@nagios libexec]# ./check_siemens_hipath -H checked.systems.ip.address
WARNING - Overall system state(minor); Failing expansion cards: HXGM3(minor); CPU Load 0%; Uptime: 62:10:08:26.67

-- bad host or community
[root@nagios libexec]# ./check_siemens_hipath --host 192.168.1.2 -C cmnty
UNKNOWN - bad host (192.168.1.2) or community string (cmnty) or SNMP not working