docker BUGFIX switch to libssh 0.9.2
docker BUGFIX switch to libssh 0.9.2

- Build libssh 0.9.2 in sysrepo-netopeer2:legacy image instead of directly
  from git to resolve build issue
Signed-off-by: Jakov Smolic <d7de33b854c7ca8b4c2b996b8e18cb8d82743062@sartura.hr>

sysrepo/sysrepo,sysrepo/sysrepo,sysrepo/sysrepo