Install encapic ENC client on puppet masters (#525)

The VM masters classify through the cobbler ENC while the k8s compilers
already use encapi. Install the client ahead of that cutover;
external_nodes still points at cobbler-enc, so classification is unchanged.

- pin the encapic package to 0.2.0 via profiles::packages::include
- add profiles::puppet::encapic managing /etc/encapic/encapic.conf from a
  hiera-driven ENCAPI_URL, ordered after Package['encapic'] so the config is
  written once the RPM that owns the path is installed
- include the class from profiles::puppet::puppetmaster

Requires encapic 0.2.0 in the rpm-internal repo.

Reviewed-on: #525
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

site/profiles/manifests/puppet/encapic.pp

@@ -0,0 +1,32 @@
+# Class: profiles::puppet::encapic
+#
+# Manages the configuration for the encapic ENC client. The package itself is
+# installed through profiles::packages (pinned in hiera); this class owns the
+# config so the encapi endpoint can change without repackaging.
+class profiles::puppet::encapic (
+  Stdlib::HTTPUrl       $encapi_url,
+  Stdlib::AbsolutePath  $config_dir = '/etc/encapic',
+  String                $config_name = 'encapic.conf',
+  String                $owner = 'root',
+  String                $group = 'root',
+) {
+
+  # The RPM ships this file as %config(noreplace), so puppet must write it only
+  # once the package is present or the install overwrites it.
+  file { $config_dir:
+    ensure  => directory,
+    mode    => '0755',
+    owner   => $owner,
+    group   => $group,
+    require => Package['encapic'],
+  }
+
+  file { "${config_dir}/${config_name}":
+    ensure  => file,
+    mode    => '0644',
+    owner   => $owner,
+    group   => $group,
+    content => "ENCAPI_URL=${encapi_url}\n",
+    require => File[$config_dir],
+  }
+}

site/profiles/manifests/puppet/puppetmaster.pp

@@ -12,6 +12,7 @@ class profiles::puppet::puppetmaster (
     include profiles::puppet::g10k
     include profiles::puppet::enc
     include profiles::puppet::cobbler_enc
+    include profiles::puppet::encapic
     include profiles::puppet::autosign
     include profiles::puppet::gems
     include profiles::helpers::certmanager