misc/vim: fix reimport guard and remove K mapping.

The "did_ftplugin" lines were ineffective and the "K" mapping was too
invasive, which is why it was removed.

R=golang-dev, dsymonds, minux.ma
CC=golang-dev
https://golang.org/cl/6823044

Author: AndrewRadev

misc/vim/ftplugin/go/fmt.vim

@@ -12,6 +12,9 @@
 "       It tries to preserve cursor position and avoids
 "       replacing the buffer with stderr output.
 "
+if exists("b:did_ftplugin_go_fmt")
+    finish
+endif
 
 command! -buffer Fmt call s:GoFormat()
 
@@ -41,4 +44,6 @@ function! s:GoFormat()
     call winrestview(view)
 endfunction
 
+let b:did_ftplugin_go_fmt = 1
+
 " vim:ts=4:sw=4:et

misc/vim/ftplugin/go/godoc.vim

@@ -32,7 +32,7 @@
 " The backslash is the default maplocalleader, so it is possible that
 " your vim is set to use a different character (:help maplocalleader).
 "
-if exists("b:did_ftplugin")
+if exists("b:did_ftplugin_go_import")
     finish
 endif
 
@@ -228,4 +228,6 @@ function! s:Error(s)
     echohl Error | echo a:s | echohl None
 endfunction
 
+let b:did_ftplugin_go_import = 1
+
 " vim:ts=4:sw=4:et

misc/vim/ftplugin/go/import.vim

@@ -72,5 +72,4 @@ To install godoc plugin:
   1. Same as 1 above.
   2. Copy or link plugin/godoc.vim to $HOME/.vim/plugin/godoc,
      syntax/godoc.vim to $HOME/.vim/syntax/godoc.vim,
-     ftplugin/go/godoc.vim to $HOME/.vim/ftplugin/go/godoc.vim.
      and autoload/go/complete.vim to $HOME/.vim/autoload/go/complete.vim.