psutil plugin for django-expvar

• pip install it
• add expvarpsutil to INSTALLED_APPS

exposes everything that it can glean from psutil.

Sample output:

{
"vmem": {
     "available": 21817942016,
     "used": 29588267008,
     "cached": 14833836032,
     "percent": 35.2,
     "free": 4071620608,
     "inactive": 11338760192,
     "active": 16109834240,
     "total": 33659887616,
     "buffers": 2912485376},
"netio": {
     "dropin": 10,
     "packets_recv": 5051051546,
     "bytes_recv": 16324722441209,
     "dropout": 0,
     "bytes_sent": 14774021978712,
     "errout": 0,
     "packets_sent": 4435177714,
     "errin": 52},
"swap": {
     "used": 6767640576,
     "percent": 21.0,
     "free": 25397030912,
     "sout": 140025290752,
     "total": 32164671488,
     "sin": 178708295680},
"cpu": {
     "guest": 0.0,
     "irq": 113.01,
     "system": 907022.44,
     "idle": 42276546.24,
     "user": 5368869.44,
     "iowait": 7038784.66,
     "nice": 1194231.6,
     "steal": 0.0,
     "softirq": 63126.39}
}