Update the plugins managment. Add the function 'omz-plugin' (inspired from bash-it)

plugins/available/knife_ssh/knife_ssh.plugin.zsh

@@ -0,0 +1,18 @@
+function knife_ssh() {
+  grep -q $1 ~/.knife_comp~ 2> /dev/null || rm -f ~/.knife_comp~;
+  ssh $(knife node show $1 | awk '/IP:/{print $2}')
+}
+
+_knife_ssh() {
+  if hash knife 2>/dev/null; then
+    if [[ ! -f ~/.knife_comp~ ]]; then
+      echo "\nGenerating ~/.knife_comp~..." >/dev/stderr
+      knife node list > ~/.knife_comp~
+    fi
+    compadd $(<~/.knife_comp~)
+  else
+    echo "Could not find knife" > /dev/stderr;
+  fi
+}
+
+compdef _knife_ssh knife_ssh