win32: Set registry value with SetValueEx not SetValue
win32: Set registry value with SetValueEx not SetValue

_winreg.SetValue only allows to set the default value on a subkey
SetValueEx lets one specify the value name and the value itself.

Additionally as a security measure we're now encapsulating all
exceptions coming from SAS handling to still at least attempt the
login, even if the SAS portion may fail.
This is just a precaution to prevent SSO from breaking due to some
unforeseen bug.

Change-Id: I51d70381de43d62e96f9f24de60bdf0226e20f54
Bug-Url: https://bugzilla.redhat.com/1158470
Signed-off-by: Vinzenz Feenstra <600e8a10eeff4f08c65e2cf493cd851025e86fd2@redhat.com>
oVirt/ovirt-guest-agent,oVirt/ovirt-guest-agent,silenceli/oga-windows,silenceli/oga-windows,silenceli/oga-windows,oVirt/ovirt-guest-agent,oVirt/ovirt-guest-agent,silenceli/oga-windows