hyper-v: mock time.sleep in test_rmtree
hyper-v: mock time.sleep in test_rmtree

Added in change I8c194320dfa0c9a00ede3cd5bf38446f896156e3, test_rmtree
always takes at least one second because time.sleep(1) is not mocked
out. It's a bit of a nit but we should always mock out sleep calls so
the tests run as fast as possible - which matters when you have over 13K
of them.

Closes-Bug: #1486203

Change-Id: I9148849574b05e4168876478af5173028b42074c

bigswitch/nova,cernops/nova,fnordahl/nova,yosshy/nova,sebrandon1/nova,sebrandon1/nova,jianghuaw/nova,isyippee/nova,openstack/nova,fnordahl/nova,mahak/nova,ted-gould/nova,CCI-MOC/nova,phenoxim/nova,klmitch/nova,cyx1231st/nova,CEG-FYP-OpenStack/scheduler,vmturbo/nova,mahak/nova,felixma/nova,BeyondTheClouds/nova,gooddata/openstack-nova,gooddata/openstack-nova,MountainWei/nova,felixma/nova,vmturbo/nova,BeyondTheClouds/nova,rajalokan/nova,cyx1231st/nova,NeCTAR-RC/nova,klmitch/nova,JianyuWang/nova,jianghuaw/nova,rahulunair/nova,noironetworks/nova,mikalstill/nova,j-carpentier/nova,jianghuaw/nova,devendermishrajio/nova,cernops/nova,vmturbo/nova,TwinkleChawla/nova,alaski/nova,scripnichenko/nova,dims/nova,cernops/nova,vmturbo/nova,cloudbase/nova,dims/nova,rajalokan/nova,sebrandon1/nova,Francis-Liu/animated-broccoli,gooddata/openstack-nova,klmitch/nova,cloudbase/nova,raildo/nova,cloudbase/nova,hanlind/nova,apporc/nova,alaski/nova,JianyuWang/nova,nikesh-mahalka/nova,CEG-FYP-OpenStack/scheduler,Juniper/nova,apporc/nova,devendermishrajio/nova,isyippee/nova,phenoxim/nova,klmitch/nova,BeyondTheClouds/nova,edulramirez/nova,hanlind/nova,openstack/nova,edulramirez/nova,NeCTAR-RC/nova,mikalstill/nova,jianghuaw/nova,openstack/nova,raildo/nova,yosshy/nova,scripnichenko/nova,rahulunair/nova,rajalokan/nova,Juniper/nova,noironetworks/nova,mikalstill/nova,nikesh-mahalka/nova,rajalokan/nova,CCI-MOC/nova,Francis-Liu/animated-broccoli,mahak/nova,zhimin711/nova,Juniper/nova,ted-gould/nova,rahulunair/nova,TwinkleChawla/nova,MountainWei/nova,gooddata/openstack-nova,hanlind/nova,Juniper/nova,zhimin711/nova,j-carpentier/nova,bigswitch/nova