Fix Post-Upgrade Kernel Validation on Ansible 2.14+ (#146)

* remove embedded template from post upgrade kernel validation conditional

* re-use rhel_dest_major_version fact in kernel check assertion conditional

* remove extra line

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Co-authored-by: Blaine Story <blaine.story@smud.org>

roles/upgrade/tasks/upgrade-validation.yml

@@ -14,7 +14,7 @@
 
 - name: Validate running kernel matches OS version
   ansible.builtin.assert:
-    that: "'el{{ rhel_dest_major_version }}' in ansible_kernel"
+    that: "'el' ~ rhel_dest_major_version in ansible_kernel"
     fail_msg: Kernel version {{ ansible_kernel }} does not match expected OS major version el{{ rhel_dest_major_version }}.
     success_msg: Current kernel version is {{ ansible_kernel }}.