gst/tcp/: Added multifdsink, made tcpserversink a subclass of fdsink, removed one of the locks, added recovery policy...

Original commit message from CVS:
* gst/tcp/Makefile.am:
* gst/tcp/gstmultifdsink.c: (gst_recover_policy_get_type),
(gst_multifdsink_get_type), (gst_multifdsink_base_init),
(gst_multifdsink_class_init), (gst_multifdsink_init),
(gst_multifdsink_debug_fdset), (gst_multifdsink_client_remove),
(gst_multifdsink_handle_client_read),
(gst_multifdsink_client_queue_data),
(gst_multifdsink_client_queue_caps),
(gst_multifdsink_client_queue_buffer),
(gst_multifdsink_handle_client_write),
(gst_multifdsink_recover_client), (gst_multifdsink_queue_buffer),
(gst_multifdsink_handle_clients), (gst_multifdsink_thread),
(gst_multifdsink_chain), (gst_multifdsink_set_property),
(gst_multifdsink_get_property), (gst_multifdsink_init_send),
(gst_multifdsink_close), (gst_multifdsink_change_state):
* gst/tcp/gstmultifdsink.h:
* gst/tcp/gsttcpplugin.c: (plugin_init):
* gst/tcp/gsttcpserversink.c: (gst_tcpserversink_get_type),
(gst_tcpserversink_class_init), (gst_tcpserversink_init),
(gst_tcpserversink_handle_server_read),
(gst_tcpserversink_handle_select),
(gst_tcpserversink_set_property), (gst_tcpserversink_get_property),
(gst_tcpserversink_init_send), (gst_tcpserversink_close):
* gst/tcp/gsttcpserversink.h:
Added multifdsink, made tcpserversink a subclass of fdsink, removed
one of the locks, added recovery policy to multifdsink.