Merge pull request #1698 from edx/feanil/lowercase_dns_rel

Work around for an issue in the Route53 module.

util/jenkins/ansible-provision.sh

@@ -77,7 +77,7 @@ if [[ -z $elb ]]; then
 fi
 
 if [[ -z $dns_name ]]; then
-  dns_name=$github_username
+  dns_name=${github_username}
 fi
 
 if [[ -z $name_tag ]]; then
@@ -102,6 +102,9 @@ if [[ -z $enable_monitoring ]]; then
   enable_monitoring="false"
 fi
 
+# Lowercase the dns name to deal with an ansible bug
+dns_name="${dns_name,,}"
+
 deploy_host="${dns_name}.${dns_zone}"
 ssh-keygen -f "/var/lib/jenkins/.ssh/known_hosts" -R "$deploy_host"