Fix typo in SSL file resource

present=>exists is in valid value and hence we are hitting issue [1].
This makes it to use correct value.

[1] https://tickets.puppetlabs.com/browse/PUP-3885

Change-Id: I54a8a6d86ebdb5211ec18eb619351baffb8f2478
(cherry picked from commit 42bcb19348)

manifests/profile/base/metrics/qdr.pp

@@ -224,7 +224,7 @@ class tripleo::profile::base::metrics::qdr (
     $final_ssl_profiles = $prep_ssl_profiles.reduce( [] ) |$memo, $prf| {
       if has_key($prf, 'caCertFileContent') {
         file { $prf['caCertFile']:
-          ensure  => exists,
+          ensure  => present,
           content => $prf['caCertFileContent'],
           mode    => '0600',
           require => File[$ssl_cert_dir]

spec/classes/tripleo_profile_base_metrics_qdr_spec.rb

@@ -210,12 +210,12 @@ describe 'tripleo::profile::base::metrics::qdr' do
           :mode => '0700'
         )
         is_expected.to contain_file('/tmp/certs/CA_wubba.pem').with(
-          :ensure => 'exists',
+          :ensure => 'present',
           :content => 'ca_wubba',
           :mode => '0600'
         )
         is_expected.to contain_file('/tmp/certs/CA_lubba.pem').with(
-          :ensure => 'exists',
+          :ensure => 'present',
           :content => 'ca_lubba',
           :mode => '0600'
         )