Fix MetricsQdrUseSSL value
Fix MetricsQdrUseSSL value

puppet-qdr expects one of the string values 'yes'/'no' instead of boolean,
so currently listeners cannot be created with SSL enabled. This patch is fixing
this issue.

Change-Id: I2dbafdc417f31eb000fbb469ae2c082cda3a5523

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates