Revert "Install SELinux packages asynchronously"

This reverts commit 5085d45d7b.

Installing packages in the background doesn't seem so stable since
sometimes we observe problems like the following one:

==> centos7: TASK [lxc_hosts : Ensure SELinux distro packages have finished installing] *****
==> centos7: FAILED - RETRYING: Ensure SELinux distro packages have finished installing (30 retries left).
==> centos7: FAILED - RETRYING: Ensure SELinux distro packages have finished installing (29 retries left).
==> centos7: FAILED - RETRYING: Ensure SELinux distro packages have finished installing (28 retries left).
==> centos7: FAILED - RETRYING: Ensure SELinux distro packages have finished installing (27 retries left).
==> centos7: FAILED - RETRYING: Ensure SELinux distro packages have finished installing (26 retries left).
==> centos7: FAILED - RETRYING: Ensure SELinux distro packages have finished installing (25 retries left).
...
==> centos7: fatal: [localhost]: FAILED! => {"ansible_job_id": "350629830198.20986", "attempts": 30, "changed": false, "finished": 0, "started": 1}
==> centos7:    to retry, use: --limit @/vagrant/tests/test.retry

As such, lets revert the change and install them in the normal way.

Change-Id: I6e6a890f2fa98e9874597b69e4caf2dfd78182f4

tasks/lxc_install_yum.yml

@@ -86,16 +86,6 @@
   tags:
     - lxc-packages
 
-- name: Install distro SELinux packages asynchronously
-  package:
-    pkg: "{{ lxc_hosts_distro_selinux_packages }}"
-    state: "{{ lxc_hosts_package_state }}"
-  register: install_selinux_packages
-  async: 600
-  poll: 0
-  tags:
-    - lxc-packages
-
 - name: Remove sub system lock if found
   file:
     path: "/var/lock/subsys/lxc"

tasks/lxc_selinux.yml

@@ -13,16 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Ensure SELinux distro packages have finished installing
-  async_status:
-    jid: "{{ install_selinux_packages.ansible_job_id }}"
-  register: _install_selinux_packages
-  until: _install_selinux_packages.finished
-  retries: 30
-  when:
-    - install_selinux_packages is defined
-    - not install_selinux_packages | skipped
-
 - name: Create directory for compiling SELinux policy
   file:
     path: "/tmp/lxc-attach-selinux/"

vars/redhat-7-host.yml

@@ -26,24 +26,18 @@ lxc_hosts_distro_packages:
   - dnsmasq
   - git
   - libseccomp
+  - libselinux
+  - libselinux-devel
   - lxc
   - lxc-devel
   - lxc-libs
   - lxc-templates
+  - policycoreutils-python
   - python2-lxc
+  - selinux-policy-devel
   - unzip
   - xz
 
-# NOTE(mhayden): This packages are required for building the SELinux policy
-# for LXC on CentOS 7. They're separate from the main package list because
-# they take a signficant of time to install and they can be installed while
-# other tasks run.
-lxc_hosts_distro_selinux_packages:
-  - libselinux
-  - libselinux-devel
-  - policycoreutils-python
-  - selinux-policy-devel
-
 lxc_xz_bin: xz
 
 lxc_cached_network_interfaces: