Avoid deprecated message of the use of apt

When the commando vagrant provision run, currently a deprecated
message is printed for `ìnstall base package`:

[DEPRECATION WARNING]: Invoking "apt" only once while using a loop via
squash_actions is deprecated. Instead of using a loop to supply multiple
items
and specifying `name: "{{ item }}"`, please use `name:
['build-essential',
'libpq-dev', 'lib32z1-dev', 'git', 'python3-dev', 'python3-setuptools',
'python3-pip', 'python3-venv', 'ruby']` and remove the loop. This
feature will
be removed in version 2.11. Deprecation warnings can be disabled by
setting
deprecation_warnings=False in ansible.cfg.

similar for `Install PostgreSQL`.

So this PR propose the use of the recommended command.

Author: eamanu

provisioning/pythondotorg.yml

@@ -12,17 +12,18 @@
 
     - name: Install base packages
       become: yes
-      apt: name={{ item }} state=latest
-      with_items:
-        - build-essential
-        - libpq-dev
-        - lib32z1-dev
-        - git
-        - python3-dev
-        - python3-setuptools
-        - python3-pip
-        - python3-venv
-        - ruby
+      apt:
+        name:
+          - build-essential
+          - libpq-dev
+          - lib32z1-dev
+          - git
+          - python3-dev
+          - python3-setuptools
+          - python3-pip
+          - python3-venv
+          - ruby
+        state: latest
       register: result
       changed_when:
         "result.stdout is defined and '0 upgraded, 0 newly installed, 0 to remove and' not in result.stdout"
@@ -32,13 +33,14 @@
       gem: name=bundler user_install=no
 
     - name: Install PostgreSQL
-      apt: name={{ item }} state=present
+      apt:
+        name:
+          - postgresql
+          - postgresql-contrib
+          - libpq-dev
+          - python-psycopg2
+        state: present
       become: yes
-      with_items:
-        - postgresql
-        - postgresql-contrib
-        - libpq-dev
-        - python-psycopg2
 
     - name: Ensure the PostgreSQL service is running
       service: name=postgresql state=started enabled=yes