`make vm-build-centos` run docker-based tests on CentOS. The
created containers should have network otherwise some tests
fail. Also fixed the BUILD_SCRIPT template to correctly
evaluate "V=1" for verbose output.

Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
---
 tests/vm/centos | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tests/vm/centos b/tests/vm/centos
index ba133ea429..7417b50af4 100755
--- a/tests/vm/centos
+++ b/tests/vm/centos
@@ -26,9 +26,9 @@ class CentosVM(basevm.BaseVM):
         export SRC_ARCHIVE=/dev/vdb;
         sudo chmod a+r $SRC_ARCHIVE;
         tar -xf $SRC_ARCHIVE;
-        make docker-test-block@centos7 V={verbose} J={jobs};
-        make docker-test-quick@centos7 V={verbose} J={jobs};
-        make docker-test-mingw@fedora V={verbose} J={jobs};
+        make docker-test-block@centos7 {verbose} J={jobs} NETWORK=1;
+        make docker-test-quick@centos7 {verbose} J={jobs} NETWORK=1;
+        make docker-test-mingw@fedora  {verbose} J={jobs} NETWORK=1;
     """
 
     def _gen_cloud_init_iso(self):
-- 
2.18.1