log test: use fixtures.StandardLogging in setUp
log test: use fixtures.StandardLogging in setUp

We already had fixtures.StandardLogging for log test.
Use this class in setUP, to save some duplicate
codes.

Change-Id: I565eea30a870f9d69f7bc75f35e55515fac6c99e
Signed-off-by: Chen Hanxiao <9f6dccda9fdf909fa791255a047bcca16f918f84@certusnet.com.cn>

gooddata/openstack-nova,openstack/nova,rahulunair/nova,mahak/nova,mikalstill/nova,klmitch/nova,mahak/nova,gooddata/openstack-nova,gooddata/openstack-nova,rahulunair/nova,gooddata/openstack-nova,mikalstill/nova,klmitch/nova,mahak/nova,klmitch/nova,openstack/nova,phenoxim/nova,klmitch/nova,mikalstill/nova,phenoxim/nova,openstack/nova,rahulunair/nova