Inject faults into iodata() values.
Inject faults into iodata() values.

This further verifies the test cases and also the enacl API. By injecting
wrong data, we verify that given incorrect data will make the system fail
and error(badarg) all over the place.

trifork/enacl,jlouis/enacl,plumlife/enacl,loucash/enacl,liveforeverx/enacl,liveforeverx/enacl,trifork/enacl,plumlife/enacl,loucash/enacl,jlouis/enacl