Install python-rhsm-certificates, handle python-boto

Add python-rhsm-certificates to the list of packages that we require, so
that the required certificates are available for the
pull-image-with-signature tests.

Add per-distribution package install tasks so that we install either
python2-boto or python-boto, depending on whether we're running on
Fedora or RHEL/CentOS, respectively.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

contrib/test/integration/system.yml

@@ -41,9 +41,9 @@
     - ostree-devel
     - pkgconfig
     - python
-    - python2-boto
     - python2-crypto
     - python-devel
+    - python-rhsm-certificates
     - python-virtualenv
     - PyYAML
     - redhat-rpm-config
@@ -57,6 +57,22 @@
   async: 600
   poll: 10
 
+- name: Add python2-boto for Fedora
+  package:
+    name: "{{ item }}"
+    state: present
+  with_items:
+   - python2-boto
+  when: ansible_distribution in ['Fedora']
+
+- name: Add python-boto for RHEL and CentOS
+  package:
+    name: "{{ item }}"
+    state: present
+  with_items:
+   - python-boto
+  when: ansible_distribution in ['RedHat', 'CentOS']
+
 - name: Add Btrfs for Fedora
   package:
     name: "{{ item }}"