Fix the bug in keys with comments.
Fix the bug in keys with comments.

Do this by iterating through the fields until finding the key type, and
then using the next field. This is the most bullet proof method that I can think of,
but this code is also fragile about future new key formats now :(

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