exec_command segfault partial fix #280
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SUMMARY
Fixes #255 which seems to have mostly been introduced trying to fix #60
ISSUE TYPE
ADDITIONAL INFORMATION
The issue with #255 is not actually anything to do with line feeds, but rather reusing the internal
libssh_channel. As mentioned at https://api.libssh.org/stable/libssh_tutor_guided_tour.html#using_ssh under "Doing Something", each call to ssh_channel_request_exec requires a fresh channel.