Integration tests for influxdb_user module (#35315)

* Added integration tests for influxdb_user
* Tests for idempotency checking and check mode

test/integration/targets/influxdb_user/aliases

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+destructive
+posix/ci/group1
+skip/osx
+skip/freebsd
+skip/rhel

test/integration/targets/influxdb_user/meta/main.yml

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+dependencies:
+  - setup_influxdb

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

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+---
+
+- include: tests.yml
+  when: ansible_distribution == 'Ubuntu' and ansible_distribution_release == 'trusty'

test/integration/targets/influxdb_user/tasks/tests.yml

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+---
+
+- name: Install influxdb python module
+  pip: name=influxdb
+
+- name: Test add admin user in check mode
+  block:
+    - name: Add admin user
+      influxdb_user: user_name=admin user_password=admin admin=yes
+      check_mode: true
+      register: add_admin_user
+
+    - name: Check that admin user adding succeeds with a change
+      assert:
+        that:
+          - add_admin_user.changed == true
+
+- name: Test add admin user
+  block:
+    - name: Add admin user
+      influxdb_user: user_name=admin user_password=admin admin=yes
+      register: add_admin_user
+
+    - name: Check that admin user adding succeeds with a change
+      assert:
+        that:
+          - add_admin_user.changed == true
+
+- name: Test add admin user idempotence
+  block:
+    - name: Add admin user
+      influxdb_user: user_name=admin user_password=admin admin=yes
+      register: add_admin_user
+
+    - name: Check that admin user adding succeeds without a change
+      assert:
+        that:
+          - add_admin_user.changed == false
+
+- name: Enable authentication and restart service
+  block:
+    - name: Enable authentication
+      lineinfile:
+        path: /etc/influxdb/influxdb.conf
+        regexp: 'auth-enabled ='
+        line: '  auth-enabled = true'
+
+    - name: Restart InfluxDB service
+      service: name=influxdb state=restarted
+
+- name: Test add user in check mode when authentication enabled
+  block:
+    - name: Add user
+      influxdb_user: user_name=user user_password=user login_username=admin login_password=admin
+      check_mode: true
+      register: add_user_with_auth_enabled
+
+    - name: Check that adding user with enabled authentication succeeds with a change
+      assert:
+        that:
+          - add_user_with_auth_enabled.changed == true
+
+- name: Test add user when authentication enabled
+  block:
+    - name: Add user
+      influxdb_user: user_name=user user_password=user login_username=admin login_password=admin
+      register: add_user_with_auth_enabled
+
+    - name: Check that adding user with enabled authentication succeeds with a change
+      assert:
+        that:
+          - add_user_with_auth_enabled.changed == true
+
+- name: Test add user when authentication enabled idempotence
+  block:
+    - name: Add the same user
+      influxdb_user: user_name=user user_password=user login_username=admin login_password=admin
+      register: same_user
+
+    - name: Check that adding same user succeeds without a change
+      assert:
+        that:
+          - same_user.changed == false

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

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+---
+
+- include: setup.yml
+  when: ansible_distribution == 'Ubuntu' and ansible_distribution_release == 'trusty'

test/integration/targets/setup_influxdb/tasks/setup.yml

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+---
+
+- name: Install https transport for apt and ca-certificates
+  apt: name={{ item }} state=latest force=yes
+  with_items:
+    - apt-transport-https
+    - ca-certificates
+
+- name: Install apt_key dependencies
+  pip: name={{ item }}
+  with_items:
+    - pyOpenSSL
+    - ndg-httpsclient
+    - pyasn1
+
+- name: Add InfluxDB public GPG key
+  apt_key: url=https://repos.influxdata.com/influxdb.key state=present
+
+- name: Add InfluxDB repository
+  apt_repository: repo='deb https://repos.influxdata.com/ubuntu trusty stable' filename='influxdb' state=present update_cache=yes
+
+- name: Install InfluxDB
+  apt: name=influxdb state=latest
+
+- name: Start InfluxDB service
+  service: name=influxdb state=started