Comment #2 on issue 2777 by rbssh is very slow

Replace the contents of /usr/bin/rbssh with the following:

EXTRA_OPTS="-o UserKnownHostsFile=$HOME/.ssh/known_hosts -o ForwardX11=no -o LogLevel=ERROR"
# see
EXTRA_OPTS="-o ControlPath=/tmp/master-%r@%h:%p -o ControlMaster=auto -o ControlPersist=10m $EXTRA_OPTS"
for k in $HOME/.ssh/id_{dsa,rsa} ; do
  test -e "$k" && EXTRA_OPTS="$EXTRA_OPTS -i $k"
exec /usr/bin/ssh $EXTRA_OPTS "$@"

Using native ssh was about 5x faster than the default Python rbssh implementation. Moreover, using the connection multiplexing feature of ssh further sped up things another 5x or so.

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