0.2.7 changes

[norrisjeremy]

• Use slfj4-test instead of logback for unit & integration tests.
• Fix exception logging in Log4j2Logger.
• Add unit tests for Log4j2Logger.
• Tweak JulLogger & JulLoggerTest to better match other loggers & tests.
• Add unit tests for Log4j2Logger's getLevel method.
• Misc cleanup of logger tests.
• Misc cleanup of LoggerTest.
• Remove unneeded logging.
• Update dependencies.
• JSch fails connection to older SSH servers - wrong MAC segment size in SSH packets #265 change buffer_margin computation to be dynamic based upon the MAC to allow connections that advertise small maximum packet sizes.
• Invalid Private Key for UNIX runs #266 fix PuTTY key parsing to work with unix line endings.
• Convert from Hashtable & Vector to HashMap & ArrayList.
• Add support for ECDSA & EdDSA type PuTTY keys.
• Support PuTTY's PPK version 3 private key format #71 add support for PuTTY version 3 format keys.
  • Encrypted PuTTY version 3 format keys requires Bouncy Castle (bcprov-jdk18on).
• Add coverage reports for integration tests.
• Archive jars.
• Unroll passphrase key derivation for PuTTY version 2 keys.
• Add logging when exceptions are swallowed.
• Test against char representation instead of int to improve readability.
• Eliminate KeyPairDeferred and instead change handling of OpenSSH V1 type keys to be more like other KeyPair types.
• Be more vigilant about clearing private key data.
• Improve PKCS8 key handling and add support for PKCS5 2.1 encryption.
• Add support for ECDSA type PKCS8 keys.
• Remove unneeded null checks.
• Add support for SCrypt type KDF for PKCS8 keys.
• Minor tweaks of PKCS8 handling.
  • PKCS8 keys using SCrypt requires Bouncy Castle (bcprov-jdk18on).
• Make some internal methods static.
• Mark Argon2 type and versions as final.
• Wrap NoClassDefFoundErrors when Bouncy Castle is unavailable.
• Add a common bzero routine.
• Mark PBKDF interface and implementation as deprecated: PBKDF2 should be used instead.
• Add support for EdDSA type PKCS8 keys.
  • EdDSA type PKCS8 keys requires Bouncy Castle (bcprov-jdk18on).
• Add a parent KDF type for all the various KDF implementations.
• Minor syntax cleanup to scala sources.
• Misc cleanup to ASN1 parsing.
• Fix warnings in scala sources.
• Convert JZlib tests from Scala to Java.
• Attempt to authenticate using other signature algorithms supported by the same public key.
  • Allow the new behavior to potentially try other algorithms to be disabled via a new config option try_additional_pubkey_algorithms.
  • This should help address both Support for optional fallback to ssh-rsa public key algorithm in case target server doesn't support "server-sig-algs" extension #262 & private key auth failure #271.
  • Additionally, add a new config option enable_pubkey_auth_query to allow skipping auth queries and proceed directly to attempting full SSH_MSG_USERAUTH_REQUEST's.
• Use standard Base64 instead of commons-codec version.
• Add an enable_auth_none config option.
  • The enable_auth_none config option controls whether an initial authentication request for the method none is sent to detect all the supported authentication methods available on the server.