'Initialize a SupportMatrixTarget instance.
:param key: Unique identifier for the hypervisor driver
:param title: Human friendly name of the hypervisor
:param driver: Name of the Nova driver
:param hypervisor: (optional) Name of the hypervisor, if many
:param architecture: (optional) Name of the architecture, if many'

def __init__(self, key, title, driver, hypervisor=None, architecture=None):

    self.key = key
    self.title = title
    self.driver = driver
    self.hypervisor = hypervisor
    self.architecture = architecture
