Fix rollback option in cli_config module (#44834)

* Fix rollback option in cli_config module

* Update rollback flag in cliconf plugins
* Add rollback api for junos cliconf plugin

* Update doc

* Update doc

test/integration/targets/junos_config/tests/cli_config/cli_basic.yaml

@@ -2,12 +2,17 @@
 - debug: msg="START cli_config/cli_basic.yaml on connection={{ ansible_connection }}"
 
 - name: setup
-  cli_config: &rm
+  cli_config: &rm1
     config: delete interfaces ge-0/0/1
   become: yes
 
+- name: setup
+  cli_config: &rm2
+    config: delete interfaces ge-0/0/2
+  become: yes
+
 - name: configure device with config
-  cli_config: &conf
+  cli_config: &conf1
     config: set interfaces ge-0/0/1 description 'test-interface'
   register: result
 
@@ -16,14 +21,32 @@
       - "result.changed == true"
 
 - name: Idempotence
-  cli_config: *conf
+  cli_config: *conf1
   register: result
 
 - assert:
     that:
       - "result.changed == false"
 
+- name: configure device with config
+  cli_config: &conf2
+    config: set interfaces ge-0/0/2 description 'test-interface'
+  register: result
+
+- name: test rollabck
+  cli_config:
+    rollback: 1
+  register: result
+
+- assert:
+    that:
+      - "result.changed == true"
+      - "'ge-0/0/2' in result.diff.prepared"
+
 - name: teardown
-  cli_config: *rm
+  cli_config: *rm1
+
+- name: teardown
+  cli_config: *rm2
 
 - debug: msg="END cli_config/cli_basic.yaml on connection={{ ansible_connection }}"