Return LPAR used memory in smcli
Return LPAR used memory in smcli

The "Used memory page" output was lost in smcli
System_Performance_Info_Query. Add it in this change.

The new output will looks like:
Performance field count: 11
CPUs: 6
CPU utilization: 45
Memory paging rate: 2
Configured memory pages: 13107200
Used memory pages: 9565489

Change-Id: Ie2a22ec802f8cdf71743befe816c0bf1a015a429

mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk