define sample cpumem data in monitor ut
define sample cpumem data in monitor ut

to avoid write the same value again and again, define two samples
in global and reuse them in test cases.

Change-Id: Icbd3755aaf0cfad6b3c404cc9f6ea5e27393228e

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