updated fuzzing

[purpleidea]

When we get to newer versions of golang, we might want to update our fuzzing. The new format looks roughly like:

func FuzzParser(f *testing.F) {
   f.Fuzz(func(t *testing.T, data []byte) {
      original fuzz function body goes here
   })
}

Then
s/return/t.Skip()/
s/panic/t.Fatal/

finally
mv fuzz.go fuzz_test.go

and import "testing"

From notes taken from twitter. TBD for some future hacker to see if all this works with corpus, etc...