ipaclient: Fix misspelled sssd options

The sssd options in the ipaclient role missed a 's' in the role. The readme
of the role used the proper names with 3 's'. The names in the role have
been fixed and if the old setting are used, they will be used in the first
place.

Also utils/ansible-ipa-client-install has been adaped to use the proper
option names now.

This fixes issue #145 (The ipaclient role misspells sssd)