Fix configuration of LVM global_filter

As far as I could tell, the global_filter config added in change
I5d5c48e188cbb9b4208096736807f082bce524e8 wasn't actually making it
into the lvm.conf. Given the volume (or rather LVM volume) related
issues we've been seeing in the gate recently, we can give this a try
to see if the global_filter setting has any positive effect.

This also adds the contents of /etc/lvm/* to the logs collected by the
jobs, so that we can see the LVM config.

Change-Id: I2b39acd352669231d16b5cb2e151f290648355c0

.zuul.yaml

@@ -430,6 +430,7 @@
         /var/log/mysql: logs
         /var/log/libvirt: logs
         /etc/libvirt: logs
+        /etc/lvm: logs
         /etc/sudoers: logs
         /etc/sudoers.d: logs
         '{{ stage_dir }}/iptables.txt': logs

lib/lvm

@@ -200,7 +200,7 @@ function set_lvm_filter {
     filter_string=$filter_string$filter_suffix
 
     clean_lvm_filter
-    sudo sed -i "/# global_filter = \[*\]/a\    $global_filter$filter_string" /etc/lvm/lvm.conf
+    sudo sed -i "/# global_filter = \[.*\]/a\        $filter_string" /etc/lvm/lvm.conf
     echo_summary "set lvm.conf device global_filter to: $filter_string"
 }