functests: Replace execute with either command or feed_command

Hope this will make people using feed_command less likely: this hides bugs.
Already found at least two:

1. msgpackparse() will show internal error: hash_add() in case of duplicate
   keys, though it will still work correctly. Currently silenced.
2. ttimeoutlen was spelled incorrectly, resulting in option not being set when
   expected. Test was still functioning somehow though. Currently fixed.

test/functional/legacy/033_lisp_indent_spec.lua

@@ -1,10 +1,10 @@
--- vim: set foldmethod=marker foldmarker=[[,]] :
 -- Test for 'lisp'
 -- If the lisp feature is not enabled, this will fail!
 
 local helpers = require('test.functional.helpers')(after_each)
 local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
-local execute, expect = helpers.execute, helpers.expect
+local command, expect = helpers.command, helpers.expect
+local wait = helpers.wait
 
 describe('lisp indent', function()
   setup(clear)
@@ -13,7 +13,7 @@ describe('lisp indent', function()
     insert([[
       (defun html-file (base)
       (format nil "~(~A~).html" base))
-      
+
       (defmacro page (name title &rest body)
       (let ((ti (gensym)))
       `(with-open-file (*standard-output*
@@ -26,29 +26,30 @@ describe('lisp indent', function()
       (as h2 (string-upcase ,ti)))
       (brs 3)
       ,@body))))
-      
+
       ;;; Utilities for generating links
-      
+
       (defmacro with-link (dest &rest body)
       `(progn
       (format t "<a href=\"~A\">" (html-file ,dest))
       ,@body
       (princ "</a>")))]])
 
-    execute('set lisp')
-    execute('/^(defun')
+    command('set lisp')
+    command('/^(defun')
     feed('=G:/^(defun/,$yank A<cr>')
+    wait()
 
     -- Put @a and clean empty line
-    execute('%d')
-    execute('0put a')
-    execute('$d')
+    command('%d')
+    command('0put a')
+    command('$d')
 
     -- Assert buffer contents.
     expect([[
       (defun html-file (base)
         (format nil "~(~A~).html" base))
-      
+
       (defmacro page (name title &rest body)
         (let ((ti (gensym)))
           `(with-open-file (*standard-output*
@@ -61,9 +62,9 @@ describe('lisp indent', function()
       	       (as h2 (string-upcase ,ti)))
       	 (brs 3)
       	 ,@body))))
-      
+
       ;;; Utilities for generating links
-      
+
       (defmacro with-link (dest &rest body)
         `(progn
            (format t "<a href=\"~A\">" (html-file ,dest))