move ifupdown2/* .

ifupdown2 code was one level deeper because ifupdown2 initially
had ifupdown2 and ifupdown2-addons as two separate packages.
Since they were combined into one package, it makes sense to
move all combined code under the top level directory

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>

docs/source/apiref.rst

@@ -0,0 +1,65 @@
+Documentation for the Code
+**************************
+
+
+ifupdownmain
+============
+
+ifupdownmain is the main ifupdown module.
+
+.. automodule:: ifupdownmain
+
+.. autoclass:: ifupdownMain
+   :members: up, down, reload, query
+
+iface
+=====
+
+.. automodule:: iface
+
+.. autoclass:: iface
+   :members: state, status, flags, priv_flags, refcnt, lowerifaces, upperifaces, add_to_upperifaces, get_attr_value, get_attr_value_first, get_attr_value_n, update_config, update_config_with_status, get_config_attr_status, compare, dump_raw, dump, dump_pretty
+
+.. autoclass:: ifaceState
+
+.. autoclass:: ifaceStatus
+
+.. autoclass:: ifaceJsonEncoder
+
+scheduler
+=========
+
+.. automodule:: scheduler
+
+.. autoclass:: ifaceScheduler
+   :members: sched_ifaces
+
+.. autoclass:: ifaceSchedulerFlags
+
+
+networkinterfaces
+=================
+
+.. automodule:: networkinterfaces
+
+.. autoclass:: networkInterfaces
+   :members: load, subscribe
+
+statemanager
+============
+
+.. automodule:: statemanager
+
+.. autoclass:: pickling
+   :members: save, save_obj, load
+
+.. autoclass:: stateManager
+   :members: read_saved_state, save_state
+
+graph
+=====
+
+.. automodule:: graph
+
+.. autoclass:: graph
+   :members: topological_sort_graphs_all, generate_dots