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

It will support argument with blanks.

Change-Id: I83313290a964bf10fe46570f43cf213ceab8a326
Fixes: bug #1220937

fabian4/trove,cp16net/trove,citrix-openstack-build/trove,openstack/trove,mmasaki/trove,citrix-openstack-build/trove,cp16net/trove,redhat-openstack/trove,hplustree/trove,zhangg/trove,changsimon/trove,zhujzhuo/openstack-trove,openstack/trove,mmasaki/trove,fabian4/trove,citrix-openstack/build-trove,redhat-openstack/trove,zhujzhuo/openstack-trove,denismakogon/trove-guestagent,changsimon/trove,mmasaki/trove,zhangg/trove,citrix-openstack-build/trove,denismakogon/trove-guestagent,redhat-openstack/trove,fabian4/trove,changsimon/trove,citrix-openstack/build-trove,zhujzhuo/openstack-trove,cp16net/trove,hplustree/trove,citrix-openstack/build-trove