Make the path to the vgpu binary configurable

Signed-off-by: John Else <john.else@citrix.com>
CA-136054: vgpu has moved to /usr/lib64

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #1752 from johnelse/ca-136054-xs64bit

CA-136054: vgpu has moved to /usr/lib64