Create zabbix user and update-alternative for proxy on el6

zabbix.spec

@@ -780,6 +780,8 @@ getent passwd zabbix > /dev/null || \
 	useradd -r -g zabbix -d %{_localstatedir}/lib/zabbix -s /sbin/nologin \
 	-c "Zabbix Monitoring System" zabbix
 :
+%endif
+
 
 %pre proxy-mysql
 getent group zabbix > /dev/null || groupadd -r zabbix
@@ -788,12 +790,14 @@ getent passwd zabbix > /dev/null || \
 	-c "Zabbix Monitoring System" zabbix
 :
 
+%if 0%{?rhel} >= 7
 %pre proxy-pgsql
 getent group zabbix > /dev/null || groupadd -r zabbix
 getent passwd zabbix > /dev/null || \
 	useradd -r -g zabbix -d %{_localstatedir}/lib/zabbix -s /sbin/nologin \
 	-c "Zabbix Monitoring System" zabbix
 :
+%endif
 
 %pre proxy-sqlite3
 getent group zabbix > /dev/null || groupadd -r zabbix
@@ -802,6 +806,7 @@ getent passwd zabbix > /dev/null || \
 	-c "Zabbix Monitoring System" zabbix
 :
 
+%if 0%{?rhel} >= 7
 %pre server-mysql
 getent group zabbix > /dev/null || groupadd -r zabbix
 getent passwd zabbix > /dev/null || \
@@ -815,6 +820,7 @@ getent passwd zabbix > /dev/null || \
 	useradd -r -g zabbix -d %{_localstatedir}/lib/zabbix -s /sbin/nologin \
 	-c "Zabbix Monitoring System" zabbix
 :
+%endif
 
 %post proxy-mysql
 %systemd_post zabbix-proxy.service
@@ -822,11 +828,13 @@ getent passwd zabbix > /dev/null || \
 	zabbix-proxy %{_sbindir}/zabbix_proxy_mysql 10
 :
 
+%if 0%{?rhel} >= 7
 %post proxy-pgsql
 %systemd_post zabbix-proxy.service
 /usr/sbin/update-alternatives --install %{_sbindir}/zabbix_proxy \
 	zabbix-proxy %{_sbindir}/zabbix_proxy_pgsql 10
 :
+%endif
 
 %post proxy-sqlite3
 %systemd_post zabbix-proxy.service
@@ -834,6 +842,7 @@ getent passwd zabbix > /dev/null || \
 	zabbix-proxy %{_sbindir}/zabbix_proxy_sqlite3 10
 :
 
+%if 0%{?rhel} >= 7
 %post server-mysql
 %systemd_post zabbix-server.service
 /usr/sbin/update-alternatives --install %{_sbindir}/zabbix_server \