/usr/lib/x86_64-linux-gnu/libssh2.so.1 is in libssh2-1 1.4.3-4.1+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libssh2.so.1.0.1
/usr/lib/x86_64-linux-gnu/libssh2.so.1.0.1