Collect lvmdump info in logs

We have been having problems with lvm and cinder recently. Record the
state of lvm to aid in debugging these issues.

Related-Bug: 1687044
Change-Id: I08989cc76889d5479338bab9162591f42f5360b1

functions.sh

@@ -869,6 +869,10 @@ function cleanup_host {
         sudo cp -r /var/core $BASE/logs/
     fi
 
+    # record lvm dumpage to debug cinder lvm issues.
+    sudo -H lvmdump
+    sudo find /root -name 'lvmdump*.tgz' -execdir cp '{}' "$BASE/logs" \;
+
     # Make sure the current user can read all the logs and configs
     sudo chown -RL $USER:$USER $BASE/logs/
     # (note X not x ... execute/search only if the file is a directory