Remove obsolete key formats

Remove obsolete key formats

This removes NETSCAPE_X509, NETSCAPE{,_ENCRYPTED}_PKEY, RSA_NET,
Netscape_RSA things. Some of the nasty tentacles that could go in
principle are used in some test suites, so we need to keep them...

All this was removed as part of OpenSSL commit 0bc2f365.

ok inoguchi jsing