Apply sane LDAP settings to C code
    
    Common LDAP code from ipa-getkeytab and ipa-join are moved to libutil.a.
    The common ipa_ldap_init() and ipa_tls_ssl_init() set the same options
    as ldap_initialize()
    
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>