Fix ECDSA algorithms

Current code was completely wrong, so validation of ECDSA didn't work.
The new tests now works, the old one now doesn't
Fix ECDSA algorithms

Current code was completely wrong, so validation of ECDSA didn't work.
The new tests now works, the old one now doesn't
Disabled two failing ECDSA tests
Merge branch 'master' of github.com:miekg/dns