Remove support for bidir controller registration

[externl]

ice/java/test/android/controller/src/main/java/com/zeroc/testcontroller/ControllerApp.java

Lines 210 to 212 in 614e051

	ProcessControllerRegistryPrx registry =
	ProcessControllerRegistryPrx.createProxy(_communicator, "Util/ProcessControllerRegistry");
	registerProcessController(adapter, registry, processController);

This was only really necessary on Android emulators and was used to setup a bi-dir connection from the controller to the python driver.

Now that the emulator controller doesn't rely on this (we just use a direct proxy). We should remove this and rely on plain driver -> controller discovery like we do for iOS.

Once this part is removed we can remove the if here

ice/scripts/Util.py

Line 2399 in 614e051

proxy.ice_pingAsync().add_done_callback(callback)

(keep the ping though)

and

ice/scripts/Util.py

Lines 2305 to 2313 in 614e051

	class ProcessControllerRegistryI(Test.Common.ProcessControllerRegistry):
	def __init__(self, remoteProcessController):
	self.remoteProcessController = remoteProcessController
	def setProcessController(self, proxy, current):
	import Test
	proxy = Test.Common.ProcessControllerPrx.uncheckedCast(current.con.createProxy(proxy.ice_getIdentity()))
	self.remoteProcessController.setProcessController(proxy)

and the relevant Slice interface.

Need to test on a device though :).