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.

Change-Id: Ibb802b21d609ea6b54fc168b17705f06ad1cb86a
Closes-Bug: #1220937

akash1808/glance,JioCloud/glance,paramite/glance,scripnichenko/glance,rajalokan/glance,klmitch/glance,akash1808/glance,rajalokan/glance,klmitch/glance,saeki-masaki/glance,openstack/glance,openstack/glance,ozamiatin/glance,redhat-openstack/glance,dims/glance,vuntz/glance,dims/glance,takeshineshiro/glance,cloudbau/glance,jumpstarter-io/glance,openstack/glance,wkoathp/glance,sigmavirus24/glance,tanglei528/glance,vuntz/glance,darren-wang/gl,tanglei528/glance,scripnichenko/glance,sigmavirus24/glance,takeshineshiro/glance,jumpstarter-io/glance,redhat-openstack/glance,kfwang/Glance-OVA-OVF,kfwang/Glance-OVA-OVF,JioCloud/glance,paramite/glance,ntt-sic/glance,ozamiatin/glance,cloudbau/glance,stevelle/glance,darren-wang/gl,ntt-sic/glance,stevelle/glance,saeki-masaki/glance,wkoathp/glance