Remove test of obsolete getNetworkUuid method

This will remove the tests for the getNetworkUuid method.
The method will be obsolete after the changes regarding
identification of networks by UUID and not name are merged
into master. Will send another patch for removing the
actual method.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>