Fix token based session creation via certificate

[DadsVacayShorts]

Environment

Operating System: WS 2019
VenafiTppPS version:3.1.6
PowerShell version:5.1

Steps to reproduce

CurrentUserCert = (Get-ChildItem -Path Cert:\currentuser\My | ?{ $_.Issuer -Like "*$IssuerDN*" -and $_.Subject -Like "*$env:username*" })[-1]
New-VenafiSession -Server $vtp_host -Certificate $CurrentUserCert  -ClientId $client_ID -Scope @{'certificate'='manage'}

Expected behavior

New Oauth session gets produced with certificate authentication using x509Certificate2 class certificate objects, i.e. a cert that comes from the user store .

PS C:\Users\tppadmin1> $CurrentUserCert.gettype()
IsPublic IsSerial Name                                     BaseType                                                                                                                              
-------- -------- ----                                     --------                                                                                                                              
True     True     X509Certificate2                         System.Security.Cryptography.X509Certificates.X509Certificate 

Actual behavior

Script produces this error

New-VenafiSession : Parameter set cannot be resolved using the specified named parameters.
At C:\Users\tppadmin1\Documents\scripts\VenafiPSExample.ps1:38 char:1
+ New-VenafiSession -Server $vtp_host -Certificate $CurrentUserCert -Pa ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [New-VenafiSession], ParameterBindingException
    + FullyQualifiedErrorId : AmbiguousParameterSet,New-VenafiSession

Screenshots

[gdbarron]

There were a few issues which needed to be fixed, not just the param set. Released with v3.1.7.