Assume centos version is at least 8.3

Removing this check allows the same code to work on centos-8 stream
where the version is reported just as '8'.

Change-Id: Icc608500a099f51e5c44cecd1d259ff6315758f7

releasenotes/notes/centos-minimum-8-3-cd80894c463ed00f.yaml

@@ -0,0 +1,9 @@
+---
+upgrade:
+  - |
+    In order to accomodate Centos-8 Stream support, it is necessary require
+    the minimum version of Centos-8 Classic to be 8.3. There are breaking
+    changes between Stream and Classic versions prior to 8.3 which break
+    ansible code that detects major/minor versions of Centos. Before
+    upgrading to Wallaby, deployers should ensure that their Centos hosts
+    are updated to 8.3.

vars/redhat-8.yml

@@ -40,11 +40,8 @@ openstack_host_kernel_modules:
   - name: ip_vs
   - name: iscsi_tcp
   - name: nf_conntrack
-  - name: "{{ ansible_facts['distribution_version'] is version('8.3', '<') | ternary('nf_conntrack_ipv4', '') }}"
-  - name: "{{ ansible_facts['distribution_version'] is version('8.3', '<') | ternary('nf_conntrack_ipv6', '') }}"
   - name: nf_defrag_ipv4
   - name: nf_nat
-  - name: "{{ ansible_facts['distribution_version'] is version('8.3', '<') | ternary('nf_nat_ipv4', '') }}"
   - name: vhost_net
 
 ## Base packages