RELEASE-1.0.0RC2

- [BUG] Fixed two memory corruption bugs (NegotiateAuth::doAuthentication, GSSAPIContext::inquireCredentials)
- [BUG] Fix usage of krb5_random_confounder which is removed as of MIT krb5-1.8
- [FEATURE] Added GSSAPIContext::registerAcceptorIdentity to register a keytab from which credentials are fetched
- [BUILDBUG] Added /usr/include/et to include path to fix kadmin headers
- [BUILDBUG] Also scan lib64/ directories for kerberos libraries