prechecks: fix check that we run on RHEL >= 7.3

prechecks.yml

@@ -29,12 +29,17 @@
   # become: yes
   tasks:
 
+    # example of the transforamtion: "7.10.123" -> "10"
+    - name: Extract minor version number from full ansible_distribution_version
+      set_fact:
+        distribution_minor_version: "{{ ansible_distribution_version|regex_replace('[0-9]\\.([0-9]+).*', '\\1') }}"
+
     - name: Check that we run on CentOS or Red Hat Enterprise Linux >= 7.3
       assert:
         that:
           - ansible_distribution == "CentOS" or ansible_distribution == "RedHat"
           - ansible_distribution_major_version == '7'
-          - ansible_distribution_version|regex_replace('7.3.*', '7.3') == '7.3'
+          - distribution_minor_version|int >= 3
 
     # Checking that NTP is configured. Based on RHEL 7 *System Administrators
     # Guide*.