Added tgtadm to sudo cmd list.  Fixes bug 927924.

We need this if we are ever to create or delete volumes.

Change-Id: If451b936a04d064feba2eefec499e1669e1837d6
diff --git a/files/sudo/nova b/files/sudo/nova
index 3231e2d..60dca2b 100644
--- a/files/sudo/nova
+++ b/files/sudo/nova
@@ -41,6 +41,7 @@
                       /usr/bin/socat,                           \
                       /sbin/parted,                             \
                       /usr/sbin/dnsmasq,                        \
+                      /usr/sbin/tgtadm,                         \
                       /usr/bin/ovs-vsctl,                       \
                       /usr/bin/ovs-ofctl,                       \
                       /usr/sbin/arping