Fix errors in the NSD

<nsd xmlns="urn:etsi:nfv:yang:etsi-nfv-nsd">

  <vnfd>

    <id>ASA</id>

    <provider>My Company</provider>

    <product-name>My Company ASAv</product-name>

    <software-version>9.8</software-version>

    <version>9.8</version>

    <vnfm-info>My Company Vnfm</vnfm-info>

    <vdu>

      <id>firewall</id>

      <name>Firewall VDU</name>

      <int-cpd>

        <id>inside</id>

      <layer-protocol xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:ethernet</layer-protocol>

      </int-cpd>

      <int-cpd>

        <id>management</id>

      <layer-protocol xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:ethernet</layer-protocol>

      </int-cpd>

      <int-cpd>

        <id>outside</id>

      <layer-protocol xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:ethernet</layer-protocol>

      </int-cpd>

      <virtual-compute-desc>asa-vcd</virtual-compute-desc>

      <virtual-storage-desc>asa-vsd</virtual-storage-desc>

      <sw-image-desc>asa-image</sw-image-desc>

    </vdu>

    <virtual-compute-desc>

      <id>asa-vcd</id>

      <virtual-memory>

        <size>4.0</size>

      </virtual-memory>

      <virtual-cpu>

        <num-virtual-cpu>2</num-virtual-cpu>

      </virtual-cpu>

    </virtual-compute-desc>

    <virtual-storage-desc>

      <id>asa-vsd</id>

    <type-of-storage xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:root-storage</type-of-storage>

      <size-of-storage>0</size-of-storage>

    </virtual-storage-desc>

    <sw-image-desc>

      <id>asa-image</id>

      <name>ASA image</name>

      <version>1.1</version>

      <checksum>

	<algorithm xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:sha-224</algorithm>

	<hash>deadbeef</hash>

      </checksum>

      <container-format>bare</container-format>

      <disk-format>qcow2</disk-format>

      <min-ram>2.0</min-ram>

      <size>1</size>

      <image>http://www.cisco.com/asa.qcow2</image>

    </sw-image-desc>

    <ext-cpd>

      <id>inside</id>

      <int-cpd>

	<vdu-id>firewall</vdu-id>

	<cpd>inside</cpd>

      </int-cpd>

      <layer-protocol xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:ethernet</layer-protocol>

    </ext-cpd>

    <ext-cpd>

      <id>management</id>

      <int-cpd>

	<vdu-id>firewall</vdu-id>

	<cpd>management</cpd>

      </int-cpd>

      <layer-protocol xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:ethernet</layer-protocol>

    </ext-cpd>

    <ext-cpd>

      <id>outside</id>

      <int-cpd>

	<vdu-id>firewall</vdu-id>

	<cpd>outside</cpd>

      </int-cpd>

      <layer-protocol xmlns:nfv="urn:etsi:nfv:yang:etsi-nfv-descriptors">nfv:ethernet</layer-protocol>

    </ext-cpd>

    <df>

      <id>normal</id>

      <vdu-profile>

        <id>firewall</id>

        <min-number-of-instances>1</min-number-of-instances>

        <max-number-of-instances>2</max-number-of-instances>

      </vdu-profile>

      <instantiation-level>

        <id>double</id>

        <vdu-level>

          <vdu-id>firewall</vdu-id>

          <number-of-instances>2</number-of-instances>

        </vdu-level>

      </instantiation-level>

      <instantiation-level>

        <id>single</id>

        <vdu-level>

          <vdu-id>firewall</vdu-id>

          <number-of-instances>1</number-of-instances>

        </vdu-level>

      </instantiation-level>

      <default-instantiation-level>single</default-instantiation-level>

    </df>

  </vnfd>

  <nsd>

    <id>firewall-nsd</id>

    <vnfd-id>ASA</vnfd-id>