connect_le is failing for autoconnect

connect_le is failing for autoconnect

[Problem] connect_le api is failing when user set
autoconnect as true .
[Cause] when auto connect is true ,
device_set_auto_connect is called
to set device autoconnect parametes and
it is return back . device_connect_le call is
not called in this case .
[Fix] Removed the dbus_message_new_method_return .
[Verification] verified by code review in upstream
bluez code and also tested by using unit test
in platform.

Change-Id: I09e3d8e1e9169cb734419f9516ba39800ee309ee
Signed-off-by: Abhishek Chandra <abhishek.ch@samsung.com>