Fix function detecion

Different shells has slightly different output of `type`:

    $ yash -c "f(){ :; }; type f"
    f: a function

    $ dash -c "f(){ :; }; type f"
    f is a shell function

    $ zsh -c "f(){ :; }; type f"
    f is a shell function from zsh

Lets only look for the word "function" which seems to be the only common
thing.

lib/tiny-cloud/init-early

@@ -32,7 +32,7 @@ install_hotplugs() {
     for module in $HOTPLUG_MODULES; do
         result='-'
         printf " $module"
-        if type "mod__$module" | grep -q "is a function"; then
+        if type "mod__$module" | grep -q -w "function"; then
             "mod__$module" && result='+' || { result='!'; rc=1; }
         fi
         printf "($result)"