Fix IsHardLink() unit tests
Fix IsHardLink() unit tests

Our API as written says a file with no other links to it is not a
hardlink, and a file with multiple links to it is a hardlink. Corrected
one test and added an additional.

PaulHigin/PowerShell,KarolKaczmarek/PowerShell,bingbing8/PowerShell,bmanikm/PowerShell,bmanikm/PowerShell,KarolKaczmarek/PowerShell,kmosher/PowerShell,JamesWTruher/PowerShell-1,kmosher/PowerShell,bingbing8/PowerShell,kmosher/PowerShell,TravisEz13/PowerShell,bingbing8/PowerShell,PaulHigin/PowerShell,JamesWTruher/PowerShell-1,daxian-dbw/PowerShell,TravisEz13/PowerShell,jsoref/PowerShell,jsoref/PowerShell,bmanikm/PowerShell,TravisEz13/PowerShell,KarolKaczmarek/PowerShell,jsoref/PowerShell,KarolKaczmarek/PowerShell,kmosher/PowerShell,PaulHigin/PowerShell,bingbing8/PowerShell,daxian-dbw/PowerShell,daxian-dbw/PowerShell,TravisEz13/PowerShell,JamesWTruher/PowerShell-1,jsoref/PowerShell,KarolKaczmarek/PowerShell,PaulHigin/PowerShell,jsoref/PowerShell,bmanikm/PowerShell,bingbing8/PowerShell,daxian-dbw/PowerShell,JamesWTruher/PowerShell-1,bmanikm/PowerShell,kmosher/PowerShell