#4607 No conflicts with nvim-lspconfig by default

Default `g:ale_disable_lsp` to a new mode `'auto'` by default. With this
setting applied, ALE will now check for the presence of nvim-lspconfig
and automatically turn off particular LSP linters if already configured
via nvim-lspconfig.

For users that do not use `nvim-lspconfig`, everything should work as
before.

ale_linters/dafny/dafny.vim

@@ -1,4 +1,5 @@
 " Author: Taylor Blau <me@ttaylorr.com>
+call ale#Set('dafny_dafny_timelimit', 10)
 
 function! ale_linters#dafny#dafny#Handle(buffer, lines) abort
     let l:pattern = '\v(.*)\((\d+),(\d+)\): (.*): (.*)'
@@ -31,7 +32,6 @@ function! ale_linters#dafny#dafny#GetCommand(buffer) abort
     return printf('dafny %%s /compile:0 /timeLimit:%d', ale#Var(a:buffer, 'dafny_dafny_timelimit'))
 endfunction
 
-call ale#Set('dafny_dafny_timelimit', 10)
 call ale#linter#Define('dafny', {
 \    'name': 'dafny',
 \    'executable': 'dafny',