Exclude slapi-nis from i686 architecture

Resolves rhbz#1556448 - 'slapi-nis: FTBFS in F28'

389-ds-base is not available on i686 architecture in Fedora 28 or later
anymore, so it is not possible to build slapi-nis on i686.

slapi-nis.spec

@@ -11,7 +11,7 @@
 
 Name:		slapi-nis
 Version:	0.56.2
-Release:	2%{?dist}
+Release:	3%{?dist}
 Summary:	NIS Server and Schema Compatibility plugins for Directory Server
 Group:		System Environment/Daemons
 License:	GPLv2
@@ -35,8 +35,8 @@ BuildRequires:	tcp_wrappers
 %if 0%{?fedora} > 14 || 0%{?rhel} > 6
 BuildRequires:	libtirpc-devel
 %endif
-%if 0%{?rhel} > 0 && 0%{?rhel} < 7
-ExclusiveArch:	x86_64 %{ix86}
+%if 0%{?fedora} > 27
+ExcludeArch: %{ix86}
 %endif
 Requires: 389-ds-base >= 1.3.5.6
 
@@ -82,6 +82,11 @@ make check
 %{_sbindir}/nisserver-plugin-defs
 
 %changelog
+* Thu Mar 15 2018 Alexander Bokovoy <abokovoy@redhat.com> - 0.56.2-3
+- Do not build on i686 in Fedora 28 or later as 389-ds-base is not available there anymore
+- Resolves rhbz#1556448
+- Remove outdated ExclusiveArch for RHEL6
+
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.56.2-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild