[BUG] ScsiLun.AlternateName data in vcsim is too large for a signed byte

[ninjarobot]

The ScsiLun alternate name in newer releases (v0.38.0 and newer) of vcsim contains data that doesn't meet the signed byte size. Here is an example of the data:

<alternateName>
    <namespace>GENERIC_VPD</namespace>
    <namespaceId>5</namespaceId>
    <data>0</data>
    <data>0</data>
    <data>0</data>
    <data>4</data>
    <data>0</data>
    <data>176</data>
    <data>177</data>
    <data>178</data>
</alternateName>

Per the vSphere API, this should be an array of xsd:byte:

An xsd:byte is called a byte, but it is actually a signed byte - between -128 and 127 per the XSD spec.

To Reproduce
Steps to reproduce the behavior:

1. Launch vcsim using docker on any tag v0.38.0 or newer: docker run --rm -it -p 8989:8989 vmware/vcsim:v0.38.0
2. Execute the WaitForUpdatesEx SOAP API, as this will return all the inventory, including this malformed data.
3. Inspect the SOAP response, looking for alternateName where you'll see the <data> fields that contain values that overflow the xsd:byte range.

Expected behavior
The <data> fields in the alternateName should fit within the signed byte range of -128 to 127, like this (behavior from v0.37.3):

<alternateName>
    <namespace>GENERIC_VPD</namespace>
    <namespaceId>5</namespaceId>
    <data>-79</data>
</alternateName>

Affected version
vcsim:v0.38.0 up until latest v0.46.0

Additional context
This worked correctly in older versions of vcsim, up until running with docker using this tag: vmware/vcsim:v0.38.0, and I suspect this is related to the fix for #3469.

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