Update sample group_vars files

The previous cherry-pick changed the defaults for the ceph-osd role; this commit is the result of thereafter running generate_group_vars_sample.sh

Signed-off-by: Matthew Vernon <mv3@sanger.ac.uk>

group_vars/docker-commons.yml.sample

@@ -0,0 +1,12 @@
+---
+# Variables here are applicable to all host groups NOT roles
+
+# This sample file generated by generate_group_vars_sample.sh
+
+# Dummy variable to avoid error because ansible does not recognize the
+# file as a good configuration file when no variable in it.
+dummy:
+
+
+#ceph_docker_registry: docker.io
+

group_vars/osds.yml.sample

@@ -144,6 +144,7 @@ dummy:
 #osd_directories:
 #  - /var/lib/ceph/osd/mydir1
 #  - /var/lib/ceph/osd/mydir2
+#osd_directories: []
 
 
 # IV. This will partition disks for BlueStore