Added a main.yml in 'vars' directory to tell it is better to override using host or group vars.

roles/common/vars/main.yml

@@ -0,0 +1,3 @@
+---
+# You can override default vars defined in defaults/main.yml here,
+# but I would advice to use host or group vars instead 

roles/haproxy/vars/main.yml

@@ -0,0 +1,3 @@
+---
+# You can override default vars defined in defaults/main.yml here,
+# but I would advice to use host or group vars instead 

roles/mds/vars/main.yml

@@ -0,0 +1,3 @@
+---
+# You can override default vars defined in defaults/main.yml here,
+# but I would advice to use host or group vars instead 

roles/mon/vars/main.yml

@@ -0,0 +1,3 @@
+---
+# You can override default vars defined in defaults/main.yml here,
+# but I would advice to use host or group vars instead 

roles/osd/vars/main.yml

@@ -0,0 +1,3 @@
+---
+# You can override default vars defined in defaults/main.yml here,
+# but I would advice to use host or group vars instead 

roles/radosgw/vars/main.yml

@@ -0,0 +1,3 @@
+---
+# You can override default vars defined in defaults/main.yml here,
+# but I would advice to use host or group vars instead