Add passing a logging level to processutils.execute
Add passing a logging level to processutils.execute

Previously, processutils.execute always logged what commands were
run at DEBUG level.  This is usually fine, but sometimes the caller
wants to log particularly important commands at INFO level instead,
and oslo should allow that.

This is oslo-incubator aa5b65882.  No other significant changes had
been made to processutils in oslo since the last sync.

Change-Id: I09dad3759bf2f759b297ee19205cf0460b9a6baa

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