automatically use platform sudoers defaults
enable sudoers.d by default
remove sysadmin group from template

this is redundant to

    node['authorization']['sudo']['groups'] = [ 'sysadmin' ]

and can potentially break systems that are not using this group
enable ssh-agent-forward by default
Merge branch 'rm-sysadmin'
Merge branch 'sudoers.d'
Merge branch 'enable-agent-forward'

Conflicts:
	attributes/default.rb