Print load before and after each test
Make it easier to figure out why tests are failing sporadically by
printing the load before and after each test. For example:
------ MGCP_Test.TC_crcx_sdp ------
(14:24:42) load average: 0,41, 0,44, 0,54
Change-Id: If7d82c3c8105b3f3ca3470ba8f525ae8468dbeae
