Added interface to select openvpn device tun or tap.

    <!-- OpenVPN settings -->

    <string name="vpn_openvpn_port">"サーバポート番号"</string>

    <string name="vpn_openvpn_protocol">"使用するプロトコル"</string>

    <string name="vpn_openvpn_device">"使用するデバイス"</string>

    <string name="vpn_openvpn_userauth">"ユーザ認証"</string>

    <string name="vpn_openvpn_userauth_summary">"追加のユーザ認証が必要な場合設定する"</string>

    <string name="vpn_openvpn_advanced_titlebar">"追加のOpenVPN設定"</string>

        <item>tcp</item>

    </string-array>

    <!-- openvpn advanced menu device entries -->

    <!-- Do not translate. -->

    <string-array name="vpn_openvpn_device_entries">

        <item>tun</item>

        <item>tap</item>

    </string-array>

    <!-- Locales in this list are displayed with the corresponding

         name from special_locale_names instead of using the name

         from Locale.getDisplayName(). -->

    <string name="vpn_pptp_encryption">PPTP encryption</string>

    <string name="vpn_openvpn_port">Server port</string>

    <string name="vpn_openvpn_protocol">Protocol to use</string>

    <string name="vpn_openvpn_device">Device to use</string>

    <string name="vpn_openvpn_userauth">User authentication</string>

    <string name="vpn_openvpn_userauth_summary">Set if additional username/password authentication needs to be used</string>

    <string name="vpn_openvpn_advanced_titlebar">Advanced Openvpn Settings</string>

       android:entryValues="@array/vpn_openvpn_protocol_entries"

       />

    <ListPreference

       android:key="set_device"

       android:title="@string/vpn_openvpn_device"

       android:dialogTitle="@string/vpn_openvpn_device"

       android:entries="@array/vpn_openvpn_device_entries"

       android:entryValues="@array/vpn_openvpn_device_entries"

       />

    <CheckBoxPreference

       android:key="set_comp_lzo"

       android:title="@string/vpn_openvpn_comp_lzo"