vim-patch:9.0.0336: tests are flaky because of using a common file name

Problem:    Tests are flaky because of using a common file name.
Solution:   Rename files and directories to be more unique.

61abe7d8f8

Cherry-pick Test_custom_complete_autoload() from patch 8.2.4584.
Cherry-pick test_delete.vim & test_edit.vim changes from patch 9.0.0323.
Cherry-pick test_edit.vim changes from patch 8.2.3637.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

test/old/testdir/test_buffer.vim

@@ -134,7 +134,7 @@ func Test_bdelete_cmd()
   call assert_fails('bdelete \)', 'E55:')
 
   " Deleting a unlisted and unloaded buffer
-  edit Xfile1
+  edit Xbdelfile1
   let bnr = bufnr()
   set nobuflisted
   enew
@@ -310,8 +310,8 @@ endfunc
 " Test for trying to load a buffer with text locked
 " <C-\>e in the command line is used to lock the text
 func Test_load_buf_with_text_locked()
-  new Xfile1
-  edit Xfile2
+  new Xlockfile1
+  edit Xlockfile2
   let cmd = ":\<C-\>eexecute(\"normal \<C-O>\")\<CR>\<C-C>"
   call assert_fails("call feedkeys(cmd, 'xt')", 'E565:')
   %bw!