relocate redundantly-named kernel files

uses subpackages for different subclasses (blocking, ioloop)

IPython/kernel/blocking/manager.py

@@ -87,4 +87,3 b' class BlockingKernelManager(KernelManager):'
     iopub_channel_class = Type(BlockingIOPubChannel)
     stdin_channel_class = Type(BlockingStdInChannel)
     hb_channel_class = Type(BlockingHBChannel)
-

IPython/kernel/manager.py

@@ -1144,4 +1144,3 b' IOPubChannelABC.register(IOPubChannel)'
 HBChannelABC.register(HBChannel)
 StdInChannelABC.register(StdInChannel)
 KernelManagerABC.register(KernelManager)
-

IPython/kernel/managerabc.py

@@ -223,4 +223,3 b' class KernelManagerABC(object):'
     @abc.abstractmethod
     def is_alive(self):
         pass
-