Fix EmbeddedAnsible ScmCredential parent class

All EmbeddedAnisble credentials should derive from the
`EmbeddedAnsible::AutomationManager::Credential` class.

app/models/manageiq/providers/embedded_ansible/automation_manager/scm_credential.rb

@@ -1,3 +1,5 @@
-class ManageIQ::Providers::EmbeddedAnsible::AutomationManager::ScmCredential < ManageIQ::Providers::EmbeddedAutomationManager::ScmCredential
+class ManageIQ::Providers::EmbeddedAnsible::AutomationManager::ScmCredential < ManageIQ::Providers::EmbeddedAnsible::AutomationManager::Credential
+  include ManageIQ::Providers::EmbeddedAutomationManager::ScmCredentialMixin
+
   FRIENDLY_NAME = "Embedded Ansible Credential".freeze
 end

app/models/manageiq/providers/embedded_automation_manager/scm_credential_mixin.rb

@@ -0,0 +1,71 @@
+module ManageIQ::Providers::EmbeddedAutomationManager::ScmCredentialMixin
+  extend ActiveSupport::Concern
+
+  included do
+    const_set("COMMON_ATTRIBUTES",
+      [
+        {
+          :component  => 'text-field',
+          :label      => N_('Username'),
+          :helperText => N_('Username for this credential'),
+          :name       => 'userid',
+          :id         => 'userid',
+        },
+        {
+          :component  => 'password-field',
+          :label      => N_('Password'),
+          :helperText => N_('Password for this credential'),
+          :name       => 'password',
+          :id         => 'password',
+          :type       => 'password',
+        },
+      ].freeze
+    )
+
+    const_set("EXTRA_ATTRIBUTES",
+      [
+        {
+          :component      => 'password-field',
+          :label          => N_('Private key'),
+          :helperText     => N_('RSA or DSA private key to be used instead of password'),
+          :componentClass => 'textarea',
+          :name           => 'ssh_key_data',
+          :id             => 'ssh_key_data',
+          :type           => 'password',
+        },
+        {
+          :component  => 'password-field',
+          :label      => N_('Private key passphrase'),
+          :helperText => N_('Passphrase to unlock SSH private key if encrypted'),
+          :name       => 'ssh_key_unlock',
+          :id         => 'ssh_key_unlock',
+          :maxLength  => 1024,
+          :type       => 'password',
+        },
+      ].freeze
+    )
+
+    const_set("API_ATTRIBUTES", (const_get("COMMON_ATTRIBUTES") + const_get("EXTRA_ATTRIBUTES")).freeze)
+    const_set("API_OPTIONS", {:label => N_('Scm'), :type => 'scm', :attributes => const_get("API_ATTRIBUTES")}.freeze)
+
+    alias ssh_key_data   auth_key
+    alias ssh_key_unlock auth_key_password
+
+    before_validation :ensure_newline_for_ssh_key
+  end
+
+  class_methods do
+    def display_name(number = 1)
+      n_('Credential (SCM)', 'Credentials (SCM)', number)
+    end
+
+    def params_to_attributes(params)
+      attrs = super.dup
+
+      attrs[:auth_key]          = attrs.delete(:ssh_key_data)    if attrs.key?(:ssh_key_data)
+      attrs[:auth_key_password] = attrs.delete(:ssh_key_unlock)  if attrs.key?(:ssh_key_unlock)
+
+      attrs
+    end
+  end
+end