qa/1069 set timezone as metric source for basic test
qa/1069 set timezone as metric source for basic test

Even for the basic testcase, we'll get timezone related failures with
the timestamps if we don't set -z

wuliming/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp