Remove unused ipa-krb5, ipa-sssd and ipaconf roles

roles/ipa-krb5/defaults/main.yml

roles/ipa-krb5/meta/main.yml

roles/ipa-krb5/tasks/main.yml

roles/ipa-krb5/templates/krb5.conf.j2

roles/ipa-krb5/vars/default.yml

roles/ipa-sssd/defaults/main.yml

roles/ipa-sssd/meta/main.yml

roles/ipa-sssd/tasks/main.yml

roles/ipa-sssd/templates/sssd.conf.j2

roles/ipa-sssd/vars/default.yml

roles/ipaconf/defaults/main.yml

roles/ipaconf/meta/main.yml

roles/ipaconf/tasks/main.yml

roles/ipaconf/templates/default.conf.j2

roles/ipaconf/vars/default.yml