[BUG] vcsim: portgroupKey and key in DistributedVirtualPorts are mistaken

[Syuparn]

Describe the bug

In vcsim, portgroup moid is set to each DistributedVirtualPort's key, while it should be set to portgroupKey.

To Reproduce

Steps to reproduce the behavior:

1. run vcsim
2. execute govc as below

govc dvs.portgroup.info -pg DC0_DVPG0 DVS0

Expected behavior

A clear and concise description of what you expected to happen.

• PortKey has the port number
• PortgroupKey has the portgroup moid

# vCenter (7.0u3)
> govc dvs.portgroup.info -pg DC0_DVPG0 DVS0
PortgroupKey: dvportgroup-28
DvsUuid:      50 21 44 2c 15 ff a7 d2-28 b0 2a c5 2c 26 45 5d
VlanId:       0
PortKey:      2

PortgroupKey: dvportgroup-28
DvsUuid:      50 21 44 2c 15 ff a7 d2-28 b0 2a c5 2c 26 45 5d
VlanId:       0
PortKey:      3

PortgroupKey: dvportgroup-28
DvsUuid:      50 21 44 2c 15 ff a7 d2-28 b0 2a c5 2c 26 45 5d
VlanId:       0
PortKey:      4

PortgroupKey: dvportgroup-28
DvsUuid:      50 21 44 2c 15 ff a7 d2-28 b0 2a c5 2c 26 45 5d
VlanId:       0
PortKey:      5

PortgroupKey: dvportgroup-28
DvsUuid:      50 21 44 2c 15 ff a7 d2-28 b0 2a c5 2c 26 45 5d
VlanId:       0
PortKey:      6

PortgroupKey: dvportgroup-28
DvsUuid:      50 21 44 2c 15 ff a7 d2-28 b0 2a c5 2c 26 45 5d
VlanId:       0
PortKey:      7

Affected version

Please provide details on the version used, e.g. release tag, commit, module version, etc.

• vcsim 0.27.2
• govc 0.27.2

Screenshots/Debug Output

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• PortKey has the portgroup moid
• PortgroupKey is empty

> govc dvs.portgroup.info -pg DC0_DVPG0 DVS0
PortgroupKey:
DvsUuid:      fea97929-4b2d-5972-b146-930c6d0b4014
VlanId:       0
PortKey:      dvportgroup-11

PortgroupKey:
DvsUuid:      fea97929-4b2d-5972-b146-930c6d0b4014
VlanId:       0
PortKey:      dvportgroup-13

Additional context
Add any other context about the problem here.

description of vSphere Web Services API

DistributedVirtualPort
key: Port key.
portgroupKey: Key of the portgroup DistributedVirtualPortgroup to which the port belongs, if any.

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