listen: Turn off CLIENT_MAX_WAIT_SECS

The idea behind this feature was to avoid the client thread in a listen
server getting stuck forever if the mirroring thread in the source died.
However, it breaks any sane implementation of max_Bps in that thread,
and there are lingering concerns over how it might operate under normal
conditions anyway.

Specifically, if iterating over the bitmap takes a long time, or even just
reading the requisite 8MB from the disc in order to send it, then the
5-second timeout could be hit, causing mirroring to fail unnecessarily.

tests/acceptance/test_dest_error_handling.rb

@@ -21,12 +21,13 @@ class TestDestErrorHandling  < Test::Unit::TestCase
     assert_no_control
   end
 
-
+=begin
+  # This is disabled while CLIENT_MAX_WAIT_SECS is removed
   def test_hello_goes_astray_causes_timeout_error
     run_fake( "source/hang_after_hello" )
     assert_no_control
   end
-
+=end
 
   def test_sigterm_has_bad_exit_status
     @env.nbd1.can_die(1)
@@ -99,3 +100,4 @@ class TestDestErrorHandling  < Test::Unit::TestCase
   end
 
 end # class TestDestErrorHandling
+