adding postgresql firewall rule (#45077)

* adding postgresql firewall rule

* fixed test problems

* add state into the doc

* use lropoller

* updated samples and some naming

test/integration/targets/azure_rm_postgresqlserver/tasks/main.yml

@@ -256,6 +256,87 @@
     that:
       - output.changed == false
 
+#
+# azure_rm_postgresqlfirewallrule
+#
+
+- name: Create instance of Firewall Rule -- check mode
+  azure_rm_postgresqlfirewallrule:
+    resource_group: "{{ resource_group }}"
+    server_name: postgresqlsrv{{ rpfx }}
+    name: firewallrule{{ rpfx }}
+    start_ip_address: 172.28.10.136
+    end_ip_address: 172.28.10.138
+  check_mode: yes
+  register: output
+- name: Assert the resource instance is well created
+  assert:
+    that:
+      - output.changed
+
+- name: Create instance of Firewall Rule
+  azure_rm_postgresqlfirewallrule:
+    resource_group: "{{ resource_group }}"
+    server_name: postgresqlsrv{{ rpfx }}
+    name: firewallrule{{ rpfx }}
+    start_ip_address: 172.28.10.136
+    end_ip_address: 172.28.10.138
+  register: output
+- name: Assert the resource instance is well created
+  assert:
+    that:
+      - output.changed
+
+- name: Create again instance of Firewall Rule
+  azure_rm_postgresqlfirewallrule:
+    resource_group: "{{ resource_group }}"
+    server_name: postgresqlsrv{{ rpfx }}
+    name: firewallrule{{ rpfx }}
+    start_ip_address: 172.28.10.136
+    end_ip_address: 172.28.10.138
+  register: output
+- name: Assert the state has not changed
+  assert:
+    that:
+      - output.changed == false
+
+- name: Delete instance of Firewall Rule -- check mode
+  azure_rm_postgresqlfirewallrule:
+    resource_group: "{{ resource_group }}"
+    server_name: postgresqlsrv{{ rpfx }}
+    name: firewallrule{{ rpfx }}
+    state: absent
+  check_mode: yes
+  register: output
+- name: Assert the state has changed
+  assert:
+    that:
+      - output.changed
+
+- name: Delete instance of Firewall Rule
+  azure_rm_postgresqlfirewallrule:
+    resource_group: "{{ resource_group }}"
+    server_name: postgresqlsrv{{ rpfx }}
+    name: firewallrule{{ rpfx }}
+    state: absent
+  register: output
+- name: Assert the state has changed
+  assert:
+    that:
+      - output.changed
+
+- name: Delete unexisting instance of Firewall Rule
+  azure_rm_postgresqlfirewallrule:
+    resource_group: "{{ resource_group }}"
+    server_name: postgresqlsrv{{ rpfx }}
+    name: firewallrule{{ rpfx }}
+    state: absent
+  register: output
+- name: Assert the state has changed
+  assert:
+    that:
+      - output.changed == false
+
 #
 # azure_rm_postgresqlserver continuation / clean up
 #