Rename ipc.hc => fiber_channel.hc

src/CMakeLists.txt

src/box/applier.h

src/box/replication.cc

src/fiber_channel.c

src/fiber_channel.h

src/lua/fiber_channel.c

src/lua/fiber_channel.h

src/lua/init.c

test/app/fiber_channel.result

test/app/fiber_channel.test.lua

test/unit/CMakeLists.txt

test/unit/fiber_channel.cc

test/unit/fiber_channel.result

test/unit/fiber_channel_stress.cc

test/unit/fiber_channel_stress.result