[CORD-2220]
Fix DNS record for prereq DNS check

Change-Id: I4fdcfe8067ecddd013e91c40fcb1e63880ff8708
diff --git a/roles/prereqs-common/tasks/main.yml b/roles/prereqs-common/tasks/main.yml
index 642a1b4..bfdd962 100644
--- a/roles/prereqs-common/tasks/main.yml
+++ b/roles/prereqs-common/tasks/main.yml
@@ -18,7 +18,7 @@
   shell: "lsmod | grep kvm_"
 
 - name: DNS Lookup Check
-  shell: "dig +short {{ dns_check_domain }} | grep {{ dns_check_ipv4 }}"
+  shell: "dig +short {{ dns_check_domain }} | grep '{{ dns_check_record }}'"
   register: dns_lookup_check_result
   until: dns_lookup_check_result.rc == 0
   retries: 3
@@ -29,7 +29,7 @@
   #    that: "{{ lookup('dig', dns_check_domain ) == dns_check_ipv4 }}"
 
 - name: DNS Global Root Connectivity Check
-  shell: "dig @{{ item }} +trace +short {{ dns_check_domain }} | grep {{ dns_check_ipv4 }}"
+  shell: "dig @{{ item }} +trace +short {{ dns_check_domain }} | grep '{{ dns_check_record }}'"
   with_items: "{{ dns_roots }}"
   register: dns_global_check_result
   until: dns_global_check_result.rc == 0