Vendor the vhd-util PPA's gpg key

We do this because the ubuntu keyservers haven't been super reliable
recently, but also because it makes this a bit more secure as we control
the entire pubkey material and avoid potential for id collisions.

Change-Id: I38988905a46d250857f8509394c2c3b7ae3c2707

files/openstack-ci-core-ppa-key.pubkey

@@ -0,0 +1,28 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: SKS 1.1.6
+Comment: Hostname: keyserver.ubuntu.com
+
+mQINBFUZtK8BEADGaOXCZ/ypqcNEU5Y3rospyaJDhi9PiLndRXz6KxZEoDljmaLzQBMiJ3/l
+nNflwcv07sBdQDqBjNClFdDbvP4ttIZsQzWYQya/uHzM3rNxbh2bw24Tz0n/+PwZ10NrGFIo
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+ai000MdNRVykrvJD/r9pb6NSzyAIrs/hDYvRjD/+7d2pd47R0CLTQJjsT9JNDlZqpU7i6+47
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+pSs=
+=cc1L
+-----END PGP PUBLIC KEY BLOCK-----

manifests/init.pp

@@ -22,8 +22,21 @@ class diskimage_builder (
   include ::pip
 
   if $support_vhd {
+    file { '/root/openstack-ci-core-ppa-key.pubkey':
+      ensure => present,
+      owner  => 'root',
+      group  => 'root',
+      mode   => '0644',
+      source => 'puppet:///modules/diskimage_builder/openstack-ci-core-ppa-key.pubkey',
+    }
     include ::apt
+    apt::key { 'openstack-ci-core-ppa-key':
+      id      => '15B6CE7C018D05F5',
+      source  => '/root/openstack-ci-core-ppa-key.pubkey',
+      require => File['/root/openstack-ci-core-ppa-key.pubkey'],
+    }
     apt::ppa { 'ppa:openstack-ci-core/vhd-util':
+      require => Apt::Key['openstack-ci-core-ppa-key'],
     }
     package { 'vhd-util':
       ensure  => present,