title: Zsh doesn't autocomplete correctly my ssh command
body: <p>I have some problem with ssh autocompletion. 
  I would like for my zsh to autcomplete on my .ssh/config file but until now it is only doing it with the /etc/hosts files. 
  I've found how to not use the hosts file by adding this configuration </p>
  
  <pre><code>zstyle ':completion:*:ssh:*' hosts off
  </code></pre>
  
  <p>But I cannot succeed in making zsh look into the .ssh/config files 
  I've tried this with little hope, but it didn't work</p>
  
  <pre><code>zstyle ':completion:*:ssh:*' config on
  </code></pre>
  
  <p>Here is my .zshrc file </p>
  
  <pre><code>    # If you come from bash you might have to change your $PATH.
      #export PATH=$HOME/bin:/usr/local/bin:/usr/local/sbin:~/Documents/workspace/flutter/bin:$PATH
  
      # Path to your oh-my-zsh installation.
      export ZSH=/Users/thoma/.oh-my-zsh
  
      # Set name of the theme to load. Optionally, if you set this to "random"
      # it'll load a random theme each time that oh-my-zsh is loaded.
      # See https://github.com/robbyrussell/oh-my-zsh/wiki/Themes
      ZSH_THEME="agnoster"
  
      # Set list of themes to load
      # Setting this variable when ZSH_THEME=random
      # cause zsh load theme from this variable instead of
      # looking in ~/.oh-my-zsh/themes/
      # An empty array have no effect
      # ZSH_THEME_RANDOM_CANDIDATES=( "robbyrussell" "agnoster" )
  
      # Uncomment the following line to use case-sensitive completion.
      # CASE_SENSITIVE="true"
  
      # Uncomment the following line to use hyphen-insensitive completion. Case
      # sensitive completion must be off. _ and - will be interchangeable.
      # HYPHEN_INSENSITIVE="true"
  
      # Uncomment the following line to disable bi-weekly auto-update checks.
      # DISABLE_AUTO_UPDATE="true"
  
      # Uncomment the following line to change how often to auto-update (in days).
      # export UPDATE_ZSH_DAYS=13
  
      # Uncomment the following line to disable colors in ls.
      # DISABLE_LS_COLORS="true"
  
      # Uncomment the following line to disable auto-setting terminal title.
      # DISABLE_AUTO_TITLE="true"
  
      # Uncomment the following line to enable command auto-correction.
      # ENABLE_CORRECTION="true"
  
      # Uncomment the following line to display red dots whilst waiting for completion.
      # COMPLETION_WAITING_DOTS="true"
  
      # Uncomment the following line if you want to disable marking untracked files
      # under VCS as dirty. This makes repository status check for large repositories
      # much, much faster.
      # DISABLE_UNTRACKED_FILES_DIRTY="true"
  
      # Uncomment the following line if you want to change the command execution time
      # stamp shown in the history command output.
      # The optional three formats: "mm/dd/yyyy"|"dd.mm.yyyy"|"yyyy-mm-dd"
      # HIST_STAMPS="mm/dd/yyyy"
  
      # Would you like to use another custom folder than $ZSH/custom?
      # ZSH_CUSTOM=/path/to/new-custom-folder
  
      # Which plugins would you like to load? (plugins can be found in ~/.oh-my-zsh/plugins/*)
      # Custom plugins may be added to ~/.oh-my-zsh/custom/plugins/
      # Example format: plugins=(rails git textmate ruby lighthouse)
      # Add wisely, as too many plugins slow down shell startup.
      plugins=(
      git, 
      zsh-autosuggestions
      )
      # support bash autocompletion
      # https://stackoverflow.com/questions/3249432/i-have-a-bash-tab-completion-script-is-t
      #autoload bashcompinit
      #bashcompinit
      source ~/.bash_profile
  
      if [[ -f /usr/share/bash-completion/completions/lpass ]]; then
              source /usr/share/bash-completion/completions/lpass
      fi
  
      source $ZSH/oh-my-zsh.sh
  
      # User configuration
  
      # export MANPATH="/usr/local/man:$MANPATH"
  
      # You may need to manually set your language environment
      # export LANG=en_US.UTF-8
  
      # Preferred editor for local and remote sessions
      # if [[ -n $SSH_CONNECTION ]]; then
      #   export EDITOR='vim'
      # else
      #   export EDITOR='mvim'
      # fi
  
      # Compilation flags
      # export ARCHFLAGS="-arch x86_64"
  
      # ssh
      # export SSH_KEY_PATH="~/.ssh/rsa_id"
  
      # Set personal aliases, overriding those provided by oh-my-zsh libs,
      # plugins, and themes. Aliases can be placed here, though oh-my-zsh
      # users are encouraged to define aliases within the ZSH_CUSTOM folder.
      # For a full list of active aliases, run `alias`.
      #
      # Example aliases
      # alias zshconfig="mate ~/.zshrc"
      # alias ohmyzsh="mate ~/.oh-my-zsh"
      export PATH="/usr/local/opt/thrift@0.9/bin:$PATH"
      zstyle ':completion:*:ssh:*' hosts off
      zstyle ':completion:*:ssh:*' config on
  </code></pre>
  
  <p>If someone can help me on this ! I would gladly appreciate. </p>
  
  <p>Thanks </p>