Replace JSCH implementation

[ebramirez]

Replace official (unmaintained) JSCH implementation with a current one like: https://github.com/mwiede/jsch

[andreoss]

@yegor256 Can you release this?

[yegor256]

@rultor release, tag is 1.9.0

[rultor]

@rultor release, tag is 1.9.0

@yegor256 OK, I will release it now. Please check the progress here

[rultor]

@rultor release, tag is 1.9.0

@yegor256 Done! FYI, the full log is here (took me 13min)

[yegor256]

@andreoss done, thanks!