spawn: remove spawn submodule

Signed-off-by: Casey Bodley <[email protected]>

Author: cbodley

.gitmodules

@@ -50,9 +50,6 @@
 [submodule "src/c-ares"]
 	path = src/c-ares
 	url = https://github.com/ceph/c-ares.git
-[submodule "src/spawn"]
-	path = src/spawn
-	url = https://github.com/ceph/spawn.git
 [submodule "src/pybind/mgr/rook/rook-client-python"]
 	path = src/pybind/mgr/rook/rook-client-python
 	url = https://github.com/ceph/rook-client-python.git

src/CMakeLists.txt

@@ -891,10 +891,6 @@ if(WITH_RBD)
   add_subdirectory(rbd_replay)
 endif(WITH_RBD)
 
-set(SPAWN_BUILD_TESTS OFF CACHE INTERNAL "disable building of spawn unit tests")
-set(SPAWN_INSTALL OFF CACHE INTERNAL "disable installation of spawn headers")
-add_subdirectory(spawn)
-
 # RadosGW
 if(WITH_KVS)
   add_subdirectory(key_value_store)