do sync before fusermount to avoid busyness
do sync before fusermount to avoid busyness

Fix bug #1013689

Change-Id: I8ae786e105c08e1b5011a1b2a1dac048a710a1cb

shail2810/nova,rajalokan/nova,BeyondTheClouds/nova,cloudbase/nova,CiscoSystems/nova,angdraug/nova,yatinkumbhare/openstack-nova,Francis-Liu/animated-broccoli,sacharya/nova,affo/nova,ruslanloman/nova,bgxavier/nova,alaski/nova,apporc/nova,rickerc/nova_audit,jianghuaw/nova,edulramirez/nova,raildo/nova,Triv90/Nova,devoid/nova,adelina-t/nova,projectcalico/calico-nova,BeyondTheClouds/nova,spring-week-topos/nova-week,aristanetworks/arista-ovs-nova,alexandrucoman/vbox-nova-driver,mahak/nova,OpenAcademy-OpenStack/nova-scheduler,zaina/nova,varunarya10/nova_test_latest,DirectXMan12/nova-hacking,cloudbau/nova,petrutlucian94/nova_dev,gooddata/openstack-nova,DirectXMan12/nova-hacking,MountainWei/nova,belmiromoreira/nova,NoBodyCam/TftpPxeBootBareMetal,saleemjaveds/https-github.com-openstack-nova,adelina-t/nova,nikesh-mahalka/nova,eharney/nova,maheshp/novatest,dstroppa/openstack-smartos-nova-grizzly,hanlind/nova,rahulunair/nova,jianghuaw/nova,NoBodyCam/TftpPxeBootBareMetal,eonpatapon/nova,Yusuke1987/openstack_template,fajoy/nova,savi-dev/nova,mgagne/nova,JianyuWang/nova,Tehsmash/nova,j-carpentier/nova,yosshy/nova,Juniper/nova,jeffrey4l/nova,DirectXMan12/nova-hacking,usc-isi/nova,alaski/nova,gspilio/nova,gspilio/nova,imsplitbit/nova,Stavitsky/nova,LoHChina/nova,petrutlucian94/nova,Francis-Liu/animated-broccoli,LoHChina/nova,imsplitbit/nova,fajoy/nova,iuliat/nova,tangfeixiong/nova,phenoxim/nova,varunarya10/nova_test_latest,Stavitsky/nova,klmitch/nova,aristanetworks/arista-ovs-nova,jianghuaw/nova,openstack/nova,cernops/nova,cyx1231st/nova,devendermishrajio/nova_test_latest,mikalstill/nova,silenceli/nova,scripnichenko/nova,shootstar/novatest,whitepages/nova,ntt-sic/nova,virtualopensystems/nova,shootstar/novatest,luogangyi/bcec-nova,JianyuWang/nova,akash1808/nova_test_latest,NewpTone/stacklab-nova,Yuriy-Leonov/nova,ted-gould/nova,orbitfp7/nova,OpenAcademy-OpenStack/nova-scheduler,takeshineshiro/nova,paulmathews/nova,berrange/nova,zhimin711/nova,TieWei/nova,alvarolopez/nova,yrobla/nova,felixma/nova,sridevikoushik31/nova,eayunstack/nova,Metaswitch/calico-nova,rrader/nova-docker-plugin,JioCloud/nova,yrobla/nova,SUSE-Cloud/nova,maelnor/nova,ntt-sic/nova,mahak/nova,gooddata/openstack-nova,akash1808/nova,mmnelemane/nova,usc-isi/nova,Juniper/nova,spring-week-topos/nova-week,sacharya/nova,devendermishrajio/nova,petrutlucian94/nova_dev,saleemjaveds/https-github.com-openstack-nova,dims/nova,devendermishrajio/nova,NewpTone/stacklab-nova,joker946/nova,raildo/nova,usc-isi/nova,apporc/nova,vladikr/nova_drafts,houshengbo/nova_vmware_compute_driver,fajoy/nova,rajalokan/nova,vmturbo/nova,sridevikoushik31/nova,NoBodyCam/TftpPxeBootBareMetal,cernops/nova,dstroppa/openstack-smartos-nova-grizzly,silenceli/nova,rahulunair/nova,tudorvio/nova,vmturbo/nova,j-carpentier/nova,leilihh/novaha,CCI-MOC/nova,savi-dev/nova,cyx1231st/nova,mgagne/nova,citrix-openstack-build/nova,tianweizhang/nova,alvarolopez/nova,jianghuaw/nova,Triv90/Nova,sebrandon1/nova,leilihh/nova,yosshy/nova,klmitch/nova,kimjaejoong/nova,barnsnake351/nova,gspilio/nova,petrutlucian94/nova,Metaswitch/calico-nova,cloudbase/nova,devoid/nova,plumgrid/plumgrid-nova,TwinkleChawla/nova,ted-gould/nova,thomasem/nova,CloudServer/nova,houshengbo/nova_vmware_compute_driver,Brocade-OpenSource/OpenStack-DNRM-Nova,cloudbau/nova,akash1808/nova,phenoxim/nova,maheshp/novatest,CEG-FYP-OpenStack/scheduler,bigswitch/nova,noironetworks/nova,NewpTone/stacklab-nova,luogangyi/bcec-nova,cloudbase/nova-virtualbox,thomasem/nova,blueboxgroup/nova,savi-dev/nova,paulmathews/nova,berrange/nova,openstack/nova,affo/nova,tianweizhang/nova,badock/nova,Yuriy-Leonov/nova,whitepages/nova,sridevikoushik31/nova,qwefi/nova,dstroppa/openstack-smartos-nova-grizzly,noironetworks/nova,sridevikoushik31/nova,mandeepdhami/nova,yatinkumbhare/openstack-nova,tealover/nova,MountainWei/nova,mikalstill/nova,tanglei528/nova,dawnpower/nova,hanlind/nova,orbitfp7/nova,angdraug/nova,akash1808/nova_test_latest,BeyondTheClouds/nova,leilihh/nova,NeCTAR-RC/nova,JioCloud/nova_test_latest,sridevikoushik31/openstack,isyippee/nova,openstack/nova,TieWei/nova,mikalstill/nova,maheshp/novatest,yrobla/nova,citrix-openstack-build/nova,gooddata/openstack-nova,belmiromoreira/nova,mahak/nova,redhat-openstack/nova,Juniper/nova,zzicewind/nova,CiscoSystems/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,rajalokan/nova,qwefi/nova,projectcalico/calico-nova,shahar-stratoscale/nova,klmitch/nova,edulramirez/nova,hanlind/nova,redhat-openstack/nova,alexandrucoman/vbox-nova-driver,felixma/nova,isyippee/nova,houshengbo/nova_vmware_compute_driver,rickerc/nova_audit,sebrandon1/nova,tealover/nova,nikesh-mahalka/nova,jeffrey4l/nova,maoy/zknova,maoy/zknova,bclau/nova,eayunstack/nova,ruslanloman/nova,leilihh/novaha,dawnpower/nova,double12gzh/nova,cloudbase/nova-virtualbox,NeCTAR-RC/nova,ewindisch/nova,tanglei528/nova,ewindisch/nova,mandeepdhami/nova,scripnichenko/nova,vmturbo/nova,fnordahl/nova,aristanetworks/arista-ovs-nova,barnsnake351/nova,watonyweng/nova,fnordahl/nova,eonpatapon/nova,shail2810/nova,vladikr/nova_drafts,badock/nova,virtualopensystems/nova,vmturbo/nova,plumgrid/plumgrid-nova,shahar-stratoscale/nova,devendermishrajio/nova_test_latest,sridevikoushik31/openstack,zaina/nova,Tehsmash/nova,tangfeixiong/nova,TwinkleChawla/nova,CCI-MOC/nova,klmitch/nova,paulmathews/nova,JioCloud/nova,rajalokan/nova,kimjaejoong/nova,rrader/nova-docker-plugin,cloudbase/nova,viggates/nova,CloudServer/nova,CEG-FYP-OpenStack/scheduler,Yusuke1987/openstack_template,gooddata/openstack-nova,takeshineshiro/nova,rahulunair/nova,zzicewind/nova,Triv90/Nova,mmnelemane/nova,tudorvio/nova,blueboxgroup/nova,sebrandon1/nova,eharney/nova,double12gzh/nova,watonyweng/nova,viggates/nova,bclau/nova,iuliat/nova,maelnor/nova,joker946/nova,Juniper/nova,zhimin711/nova,sridevikoushik31/openstack,dims/nova,bigswitch/nova,maoy/zknova,cernops/nova,SUSE-Cloud/nova,bgxavier/nova,JioCloud/nova_test_latest