sssctl: use internal API to remove files Reviewed-by: Petr Cech <pcech@redhat.com>

sssctl: Consistent commands naming Use TOPIC-ACTION pattern for sssctl command names. Resolves: https://fedorahosted.org/sssd/ticket/3087 Reviewed-by: Pavel Březina <pbrezina@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

sssctl: new tool Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>