fix debian release version
support GSSAPIAuth back

GSSAPIAuthentication has not been supported
due to PreferredAuthentications trick ( 2bdba17a85 )
Also add back gssapi-keyex

While this is not currently implemented in openssh as far as I know,
there is patch floating around on the web and this may land one day
upstream.
Merge pull request #4049 from mscherer/fix_no_kerberos

Fix no kerberos
Use StringIO to feed md5 calculation to prevent unicode issues

Fixes #4014
Merge pull request #3999 from sergevanginderachter/debversion

fix debian release version
Fixed #3767 - mysql_user command fails with dots (and underscores) in
database names.
Cleaning up whitspace issues in the mysql_user module
Fixes for python 2.4 support, better collection of riak version.