Stop appending algorithms the user hasn't configured
Stop appending algorithms the user hasn't configured

By appending these algorithms, the user configuration is used as a preference
list instead of a white list.
This means that a connection might use a weaker algorithm than expected.

ccoenen/net-ssh,delameko/net-ssh,askl56/net-ssh,zBMNForks/net-ssh,net-ssh/net-ssh,donv/net-ssh,dominics/net-ssh,mfazekas/net-ssh,causton81/net-ssh,thechile/net-ssh,Teino1978-Corp/net-ssh,TiagoCardoso1983/net-ssh,Eric-Guo/net-ssh