patch 8.1.0530: channel and terminal tests that start a server can be flaky

Problem:    Channel and terminal tests that start a server can be flaky.
Solution:   Add all channel and terminal tests that start a server to the list
            of flaky tests.

src/testdir/runtest.vim

@@ -274,15 +274,23 @@ endif
 
 " Names of flaky tests.
 let s:flaky = [
+      \ 'Test_call()',
+      \ 'Test_channel_handler()',
       \ 'Test_client_server()',
       \ 'Test_close_and_exit_cb()',
+      \ 'Test_close_callback()',
+      \ 'Test_close_handle()',
+      \ 'Test_close_lambda()',
+      \ 'Test_close_partial()',
       \ 'Test_collapse_buffers()',
       \ 'Test_communicate()',
       \ 'Test_cwd()',
       \ 'Test_diff_screen()',
+      \ 'Test_exit_callback()',
       \ 'Test_exit_callback_interval()',
       \ 'Test_nb_basic()',
       \ 'Test_oneshot()',
+      \ 'Test_open_delay()',
       \ 'Test_out_cb()',
       \ 'Test_paused()',
       \ 'Test_pipe_through_sort_all()',
@@ -290,13 +298,35 @@ let s:flaky = [
       \ 'Test_popup_and_window_resize()',
       \ 'Test_quoteplus()',
       \ 'Test_quotestar()',
+      \ 'Test_raw_one_time_callback()',
       \ 'Test_reltime()',
       \ 'Test_repeat_three()',
+      \ 'Test_server_crash()',
+      \ 'Test_terminal_ansicolors_default()',
+      \ 'Test_terminal_ansicolors_func()',
+      \ 'Test_terminal_ansicolors_global()',
       \ 'Test_terminal_composing_unicode()',
+      \ 'Test_terminal_env()',
+      \ 'Test_terminal_hide_buffer()',
+      \ 'Test_terminal_make_change()',
       \ 'Test_terminal_noblock()',
       \ 'Test_terminal_redir_file()',
+      \ 'Test_terminal_response_to_control_sequence()',
+      \ 'Test_terminal_scrollback()',
+      \ 'Test_terminal_split_quit()',
+      \ 'Test_terminal_termwinkey()',
+      \ 'Test_terminal_termwinsize_mininmum()',
+      \ 'Test_terminal_termwinsize_option_fixed()',
+      \ 'Test_terminal_termwinsize_option_zero()',
       \ 'Test_terminal_tmap()',
+      \ 'Test_terminal_wall()',
+      \ 'Test_terminal_wipe_buffer()',
+      \ 'Test_terminal_wqall()',
+      \ 'Test_two_channels()',
+      \ 'Test_unlet_handle()',
       \ 'Test_with_partial_callback()',
+      \ 'Test_zero_reply()',
+      \ 'Test_zz1_terminal_in_gui()',
       \ ]
 
 " Locate Test_ functions and execute them.

src/version.c

@@ -792,6 +792,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    530,
 /**/
     529,
 /**/