Fix race condition in reboot flag test

PR projectatomic#368 added a check for a boot_id to confirm reboots in the reboot
role.  This caused a race condition in the rpm_ostree_install and
rpm_ostree_uninstall roles when using the reboot flag.

The reboot role has an option to not perform a reboot and just check
that the system comes down and back up.  This was leverage by
rpm_ostree_install and rpm_ostree_uninstall roles to fire the the
respective commands with the -r flag.  The -r flag causes a reboot to
occur when the command executes but requires to be run asychronously
(the command won't return when the system goes down and will cause
Ansible to fail).  When rpm_ostree_install/rpm_ostree_uninstall was
called with the -r flag it calls the reboot role.  If the reboot role
can execute before the reboot occurs, it will successfully execute.
If the system goes down before the reboot role can grab the boot_id,
it will fail.

This PR modifies the reboot_flag test to not use the reboot role.  It
copies most of the logic from the reboot role into the test itself.
Since this was a corner case for the -r flag, I felt like it was an
appropriate exception to not re-use the role.

tests/pkg-layering/reboot_flag.yml

@@ -1,24 +1,81 @@
 ---
 # set ft=ansible
 #
+- set_fact:
+    real_ansible_host: "{{ ansible_host }}"
+    timeout: "{{ cli_reboot_timeout | default('300') }}"
 
-- import_role:
-    name: rpm_ostree_install
-  vars:
-    roi_packages: "{{ g_pkg1 }}"
-    roi_reboot: true
+# Have to account for both because Fedora STR uses the old version of these
+# inventory values for some reason.
+- when: ansible_port is defined
+  set_fact:
+    real_ansible_port: "{{ ansible_port }}"
+
+- when: ansible_ssh_port is defined
+  set_fact:
+    real_ansible_port: "{{ ansible_ssh_port }}"
+
+- name: Get original bootid
+  command: cat /proc/sys/kernel/random/boot_id
+  register: orig_bootid
+
+- name: Package layer {{ g_pkg1 }} with reboot flag
+  command: rpm-ostree install {{ g_pkg1 | quote }} -r
+  async: 60
+  poll: 0
+  ignore_errors: true
+
+- name: wait for hosts to come back up
+  local_action:
+    wait_for host={{ real_ansible_host }}
+    port={{ real_ansible_port | default('22') }}
+    state=started
+    delay=30
+    timeout={{ timeout }}
+    search_regex="OpenSSH"
+  become: false
+
+# I'm not sure the retries are even necessary, but I'm keeping them in
+- name: Wait until bootid changes
+  command: cat /proc/sys/kernel/random/boot_id
+  register: new_bootid
+  until: new_bootid.stdout != orig_bootid.stdout
+  retries: 6
+  delay: 10
 
 - import_role:
     name: rpm_ostree_install_verify
   vars:
     roiv_package_name: "{{ g_pkg1 }}"
     roiv_binary_name: "{{ g_pkg1 }}"
 
-- import_role:
-    name: rpm_ostree_uninstall
-  vars:
-    rou_packages: "{{ g_pkg1 }}"
-    rou_reboot: true
+- name: Get original bootid
+  command: cat /proc/sys/kernel/random/boot_id
+  register: orig_bootid
+
+- name: Remove {{ g_pkg1 }} with reboot flag
+  command: rpm-ostree uninstall {{ g_pkg1 | quote }} -r
+  async: 60
+  poll: 0
+  ignore_errors: true
+
+- name: wait for hosts to come back up
+  local_action:
+    wait_for host={{ real_ansible_host }}
+    port={{ real_ansible_port | default('22') }}
+    state=started
+    delay=30
+    timeout={{ timeout }}
+    search_regex="OpenSSH"
+  become: false
+
+# I'm not sure the retries are even necessary, but I'm keeping them in
+- name: Wait until bootid changes
+  command: cat /proc/sys/kernel/random/boot_id
+  register: new_bootid
+  until: new_bootid.stdout != orig_bootid.stdout
+  retries: 6
+  delay: 10
 
 - import_role:
     name: rpm_ostree_uninstall_verify