py-asyncssh: updated to 1.15.0

Release 1.15.0:

Added the ability to pass keyword arguments provided in the scp() command through to asyncssh.connect() calls it makes, allowing things like custom credentials to be specified.
Added support for a reuse_port argument in create_server(). If set, this will be passed to the asyncio loop.create_server() call which creates listening sockets.
Added support for 窶徭oft窶� EOF when line editing in enabled so that EOF can be signalled multiple times on a channel. When Ctrl-D is received on a channel with line editing enabled, EOF is returned to the application but the channel remains open and capable of accepting more input, allowing an interactive shell to process the EOF for one command but still accept input for subsequent commands.
Added support for the Windows 10 OpenSSH ssh-agent. Thanks go to SamP20 for providing an initial proof of concept and a suggested implementation.
Reworked scoped link-local IPv6 address normalization to work better on Linux systems.
Fixed a problem preserving directory structure in recursive scp().
Fixed SFTP chmod tests to avoid attempting to set the sticky bit on a plain file, as this caused test failures on FreeBSD.
Updated note in SSHClientChannel窶冱 send_signal() documentation to reflect that OpenSSH 7.9 and later should now support processing of signal messages.


(adam)