Removing to_json because before ansible v2.13 its returning dictionar…

…y and from its returning as string.

Actually the orignal behaviour of this function is to return string but in ansible 2.12 was a mistake i guess.
Now in ansible 2.13 the original behaviour is back so we don't need to use to_json
Refer Doc: ansible/ansible#76443 (comment)
Bug:- gluster#135

roles/backend_setup/tasks/get_vg_groupings.yml

@@ -5,7 +5,7 @@
    gluster_volumes_by_groupname_pre: >-
     {%- set output={} -%}
     {%- for grouper, devicesConf in volume_groups | groupby('vgname') -%}
-      {%- set confs=[] -%}    
+      {%- set confs=[] -%}
       {%- for deviceConf in devicesConf -%}
         {%- if deviceConf.pvname is defined -%}
           {%- for device in deviceConf.pvname.split(',') -%}
@@ -15,7 +15,7 @@
           {%- endfor -%}
         {%- endif -%}
       {%- endfor -%}
-      {{- output.__setitem__(grouper, confs) -}}      
+      {{- output.__setitem__(grouper, confs) -}}
     {%- endfor -%}
     {%- if  hostvars[inventory_hostname].ansible_lvm is defined and hostvars[inventory_hostname].ansible_lvm.pvs is defined -%}
       {%- for device, pvs in hostvars[inventory_hostname].ansible_lvm.pvs.items() -%}
@@ -24,7 +24,7 @@
         {%- endif -%}
       {%- endfor -%}
     {%- endif -%}
-    {{- output | to_json -}}    
+    {{- output -}}
 
 - name: Check if vg block device exists
   shell: >
@@ -51,4 +51,4 @@
         {{- output.__setitem__(vgname, confs) -}}
       {%- endfor -%}
     {%- endfor -%}
-    {{- output | to_json -}}
+    {{- output -}}

roles/backend_setup/tasks/thick_lv_create.yml

@@ -31,7 +31,7 @@
       {{- output.append({"vgname": cnf.vgname, "raid": cnf.raid | default() , "pvname": (cnf.pvs|default('')).split(',') | select | list | unique | join(',')}) -}}
       {%- endif -%}
       {%- endfor -%}
-      {{- output | to_json -}}
+      {{- output -}}
   when: gluster_infra_thick_lvs is defined and gluster_infra_thick_lvs is not none and gluster_infra_thick_lvs|length >0
 
 - name: Make sure thick pvs exists in volume group
@@ -129,4 +129,3 @@
   loop_control:
    index_var: index
   when: item is not none and lv_device_exists.results[index].stdout_lines is defined and "0" not in lv_device_exists.results[index].stdout_lines
-

roles/backend_setup/tasks/thin_pool_create.yml

@@ -68,7 +68,7 @@
       {{- output.append({"vgname": cnf.vgname, "pvname": (cnf.pvs|default('') ~ ',' ~ (cnf.meta_pvs|default(''))).split(',') | select | list | unique | join(',')}) -}}
       {%- endif -%}
       {%- endfor -%}
-      {{- output | to_json -}}
+      {{- output -}}
   when: gluster_infra_thinpools is defined and gluster_infra_thinpools is not none and gluster_infra_thinpools|length >0
 
 # https://github.com/ansible/ansible/issues/13262
@@ -298,4 +298,3 @@
   #            --zero n"
   with_items: "{{ gluster_infra_thinpools }}"
   when: gluster_infra_thinpools is defined and item.raid is not defined
-

roles/backend_setup/tasks/thin_volume_create.yml

@@ -49,7 +49,7 @@
       {{- output.append({"vgname": cnf.vgname, "pvname": (cnf.pvs|default('') ~ ',' ~ (cnf.meta_pvs|default(''))).split(',') | select | list | unique | join(',')}) -}}
       {%- endif -%}
       {%- endfor -%}
-      {{- output | to_json -}}
+      {{- output -}}
   when: gluster_infra_lv_logicalvols is defined and gluster_infra_lv_logicalvols is not none and gluster_infra_lv_logicalvols|length >0
 
 
@@ -151,4 +151,3 @@
    gluster_infra_lv_logicalvols is defined and gluster_infra_lv_logicalvols is not none and gluster_infra_lv_logicalvols|length >0 and item is defined and item is not none
    and lvt_device_exists.results[index].stdout_lines is defined and "0" not in lvt_device_exists.results[index].stdout_lines
    and ((item.opts is not defined or "raid" not in item.opts) and item.meta_pvs is not defined and item.meta_opts is not defined)
-