Work around hpcloud hostname issue.

The hostname needs to be in /etc/hosts, we can't rely on
the dns server that hpcloud is using now; it breaks during
nova network reconfiguration, and that breaks sudo.

Change-Id: I4f0a39f5d629f1eeaf47af66528db3c63692810b

devstack-vm-gate-wrap.sh

@@ -43,6 +43,16 @@ if [ "$DEVSTACK_GATE_TEMPEST" -eq "1" ]; then
     PROJECTS="openstack/tempest $PROJECTS"
 fi
 
+# HPcloud stopped adding the hostname to /etc/hosts with their
+# precise images.
+
+HOSTNAME=`/bin/hostname`
+if ! grep $HOSTNAME /etc/hosts >/dev/null
+then
+  echo "Need to add hostname to /etc/hosts"
+  sudo bash -c 'echo "127.0.1.1 $HOSTNAME" >>/etc/hosts'
+fi
+
 cd $WORKSPACE
 
 ORIGINAL_GERRIT_PROJECT=GERRIT_PROJECT