DSA Auth Key Support

[Nigel Metheringham]

This appears to be rather poorly supported compared to the rsa key 
equivalent...

The man page implies that ~/.ssh/authorized_keys &  
~/.ssh/authorized_keys2 are similar format.  In fact the code will only 
read DSA keys from the ~/.ssh/authorized_keys2 file - the options 
entries are not supported, and putting options in causes key 
recognition to fail.

I guess ideally the key reader needs to strip off the pre-key material, 
and then pass it to a common options parser shared with the rsa key 
handler (why duplicate the code).  An alternative is that the options 
could be added to the end of the key line... I don't like that much, 
but in either case the options ought to be supported.

	Nigel.
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[ Nigel Metheringham                  Nigel.Metheringham at VData.co.uk ]
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