[ANNOUNCE] Apache SSHD 2.1.0 released

[Guillaume Nodet <gn...@apache.org>]

The Apache SSHD project is pleased to announce the release of SSHD 2.1.0
version.

Apache SSHD is a 100% pure java library to support the SSH protocols on both
the client and server side. This library can leverage Apache MINA and also
Netty - scalable and high performance asynchronous IO libraries. SSHD does
not really aim at being a replacement for the SSH client or SSH server from
Unix operating systems, but rather provides support for Java based
applications
requiring SSH support.

A few backward incompatible changes have been made since the previous
release, thus the version has been named 2.1 accordingly, in order to
emphasize this fact. The major issues addressed in this release are:

* In accordance with the policy of making the SSHD code less monolithic in
nature, 2 new artifacts have been established:

    - sshd-common - contains common code that is used throughout the other
artifacts - mainly SSH related definitions and support code that
    deals with keys, ciphers, fingerprints, etc.. - but no client or server
code. The Maven dependencies have been updated accordingly, so
    users who declare a dependency on "sshd-core" (and other previous
version artifacts) will automatically include the "sshd-common" artifact as
well.

    - sshd-putty - ("spin off" from sshd-contrib) - contains the code
necessary to use Putty key files for authentication. Users who
    previously used "sshd-contrib" Maven dependency for this purpose should
replace it with "sshd-putty".

* Fixed some issues related to port forwarding - mainly correctly
un-binding the locally bound ports used for tunnels.

* Fixed the ability to disable registering security providers using system
property configuration.

* Use Nio2ServiceFactoryFactory as the hardwired default if no other found
or explicitly set.

Users are encouraged to read the documentation available at
https://github.com/apache/mina-sshd/ which has been updated to reflect the
necessary code changes.

Advisory notice regarding building the code from the released (ZIP/TAR.GZ)
sources distribution:
------------------------------------------------------------------------------------------------

A minor issue has been discovered in this context for users who wish to
build the artifacts from these distributions instead of the GIT repository.
There are 2 "hostkey.ser" files that have been included by mistake - one in
the "sshd-core" folder and the other in the"sshd-netty" one. These files
are actually products of previous builds, and they interfere with the unit
tests causing them to fail. Users who wish to build the project from the
ZIP/TAR.GZ source distributions should delete the 2 aforementioned files
before proceeding with the build.

In this context it is important to emphasize:

* The said problem affects the build process only when it is attempting to
run the unit tests - the released production artifacts on Maven Central or
the ones generated locally as a result of the build process are not
affected in any way.
* This issue does not affect in any way users who wish to build the
artifacts from the GIT repository sources.
* The "offending" files have been correctly excluded in the latest
development master branch - so future releases should no longer suffer from
this problem.

We recommend all users to upgrade to this release - we consider this a
stable
and production ready release.

On behalf of the Apache Mina team,
Guillaume Nodet