Enclose command args in with_venv.sh
Enclose command args in with_venv.sh

Sync tools/with_venv.sh from oslo, it will support argument with
blanks.

Closes-Bug: #1220937
Change-Id: Id10528efcdd1abad3009c13f2c5bde6dcf172520

himanshu-setia/keystone,jonnary/keystone,blueboxgroup/keystone,jumpstarter-io/keystone,derekchiang/keystone,idjaw/keystone,JioCloud/keystone,ajayaa/keystone,klmitch/keystone,dsiddharth/access-keys,cernops/keystone,jamielennox/keystone,townbull/keystone-dtrust,rushiagr/keystone,mahak/keystone,openstack/keystone,roopali8/keystone,vivekdhayaal/keystone,klmitch/keystone,citrix-openstack-build/keystone,promptworks/keystone,ajayaa/keystone,himanshu-setia/keystone,rodrigods/keystone,JioCloud/keystone,maestro-hybrid-cloud/keystone,cernops/keystone,rajalokan/keystone,dsiddharth/access-keys,rickerc/keystone_audit,idjaw/keystone,cloudbau/keystone,townbull/keystone-dtrust,jumpstarter-io/keystone,promptworks/keystone,rajalokan/keystone,reeshupatel/demo,mahak/keystone,UTSA-ICS/keystone-kerberos,mahak/keystone,derekchiang/keystone,promptworks/keystone,ilay09/keystone,dstanek/keystone,vivekdhayaal/keystone,dsiddharth/access-keys,dims/keystone,dstanek/keystone,nuxeh/keystone,openstack/keystone,blueboxgroup/keystone,vivekdhayaal/keystone,jumpstarter-io/keystone,ntt-sic/keystone,openstack/keystone,jamielennox/keystone,cloudbau/keystone,dstanek/keystone,MaheshIBM/keystone,ging/keystone,rodrigods/keystone,reeshupatel/demo,rushiagr/keystone,maestro-hybrid-cloud/keystone,townbull/keystone-dtrust,takeshineshiro/keystone,rickerc/keystone_audit,dims/keystone,takeshineshiro/keystone,nuxeh/keystone,UTSA-ICS/keystone-kerberos,citrix-openstack-build/keystone,cloudbau/keystone,derekchiang/keystone,nuxeh/keystone,jonnary/keystone,citrix-openstack-build/keystone,ilay09/keystone,rickerc/keystone_audit,ging/keystone,roopali8/keystone,reeshupatel/demo,rajalokan/keystone,ntt-sic/keystone,rushiagr/keystone,MaheshIBM/keystone,ilay09/keystone,ntt-sic/keystone