Use getent command instead of host

SiteTests/FroNtier/tests/CE-cms-squid

@@ -99,29 +99,12 @@ check_proxies() {
             *"(proxyurl="*)
                 hostname=${proxy#*//}
                 hostname=${hostname%:*}
-                IP_addresses=`host $hostname | grep "has.*address" | awk '{ print $NF }'`
+                # The frontier client does not work with IPv6 addresses in URLs for now
+                IP_addresses=`getent ahostsv4 $hostname | awk '/STREAM/{print $1}'`
                 if [ -z "$IP_addresses" ]; then
-                    echo "Host $hostname not found"
-                    echo
-                    ever_failed=true
-                    continue
+                    IP_addresses=$hostname
                 fi
-                IPv4_addresses=()
-                IPv6_addresses=()
                 for IP_address in $IP_addresses; do
-                    if [[ $IP_address =~ .*:.* ]]; then
-                        IPv6_addresses+=( "[$IP_address]" )
-                    else
-                        IPv4_addresses+=( $IP_address )
-                    fi
-                done
-                if [ ${#IPv4_addresses[@]} -eq 0 ]; then
-                    # The frontier client does not work with IPv6 addresses in URLs for now
-                    IP_addresses=( $hostname ) # ( "${IPv6_addresses[@]}" )
-                else
-                    IP_addresses=( "${IPv4_addresses[@]}" )
-                fi
-                for IP_address in "${IP_addresses[@]}"; do
                     proxy_IP=`echo $proxy | sed "s/$hostname/$IP_address/g"`
                     echo "Query $proxy started:" `date`
                     echo 'select 1 from dual' | FRONTIER_SERVER="$proxy_IP(serverurl=http://cmsfrontier.cern.ch:8000/FrontierProd)(failovertoserver=no)" fn-req > $output