Extend govc functionality with FindGroupsInGroup method

[abonat]

The issue:
I did:
govc sso.group.update -g -a dnsadmins@corp.local SyncUsers
And just seeking for an Ansible compatible way to validate if the group dnsadmins@corp.local is a member of the group SyncUsers@vsphere.local For example Ansible module to report 'changed' state correctly

So:
$ govc sso.group.ls SyncUsers
SyncUsers hstoyanov@corp.local
It reports only the members, which are users and skips the groups.

As a solution:
To use the FindGroupsInGroup in govc
I did some coding and now I have this:
govmomi/govc$ go run . sso.group.lsgroups -json syncusers [ { "Id": { "Name": "DnsAdmins", "Domain": "corp.local" }, "Alias": { "Name": "DnsAdmins", "Domain": "SAPHEC" }, "Details": { "Description": "DNS Administrators Group" } } ]
As an additional:
Both the CLI govc sso.group.ls -json SyncUsers and govc sso.group.lsgroups -json syncusers output the same json format and it's easy to combine the dicts in Ansible or Python

[github-actions]

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[abonat]

I will push my PR soon