Support finding Portgroups by ID in Finder.Network

[dougm]

Description

With standard vSphere networking, Portgroups cannot have the same name within the same network folder.
With NSX, Portgroups can have the same name, even within the same Switch. In this case, using an inventory path
results in a MultipleFoundError. A MOID, switch UUID or segment ID can be used instead, as both are unique.

• Add ContainerView.FindAny method
• Add nsx backing and SegmentId defaults to the simulator for testing
• Add simulator support for renaming a Portgroup, only allowing nsx to have duplicate names

Note that applications using Finder.Network do not require any code changes to use this functionality. Only the go module dependency needs to be bumped to include this change.

Type of change

Please mark options that are relevant:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• This change requires a documentation update
• Build related change

How Has This Been Tested?

• Added TestFindNetwork that uses Finder.Network with MOID, Switch UUID and Segment ID
• Added govc tests using the -net flags with MOID, Switch UUID and Segment ID

Checklist:

• My code follows the CONTRIBUTION guidelines of
  this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

[saimanoj01]

lgtm. Thanks a lot for the quick fix.