Resolved rc!=0 problem by replacing fgrep with awk. Added ipv4 filter…

…ing to get only v4 peers in case of show ip bgp neighbors (sonic-net#2756)

Co-authored-by: Saurabh Ghorpade <saghorpa@cisco.com>

scripts/generate_dump

@@ -521,12 +521,12 @@ save_bgp_neighbor() {
     local asic_id=${1:-""}
     local ns=$(get_vtysh_namespace $asic_id)
 
-    neighbor_list_v4=$(${timeout_cmd} bash -c "vtysh $ns -c 'show ip bgp neighbors' | grep 'BGP neighbor is' | awk -F '[, ]' '{print \$4}'")
+    neighbor_list_v4=$(${timeout_cmd} bash -c "vtysh $ns -c 'show ip bgp neighbors' | grep 'BGP neighbor is' | awk -F '[, ]' '{print \$4}' | awk /\\\./")
     for word in $neighbor_list_v4; do
         save_cmd "vtysh $ns -c \"show ip bgp neighbors $word advertised-routes\"" "ip.bgp.neighbor.$word.adv$asic_id"
         save_cmd "vtysh $ns -c \"show ip bgp neighbors $word routes\"" "ip.bgp.neighbor.$word.rcv$asic_id"
     done
-    neighbor_list_v6=$(${timeout_cmd} bash -c "vtysh $ns -c 'show bgp ipv6 neighbors' | grep 'BGP neighbor is' | awk -F '[, ]' '{print \$4}' | fgrep ':'")
+    neighbor_list_v6=$(${timeout_cmd} bash -c "vtysh $ns -c 'show bgp ipv6 neighbors' | grep 'BGP neighbor is' | awk -F '[, ]' '{print \$4}' | awk /:/")
     for word in $neighbor_list_v6; do
         save_cmd "vtysh $ns -c \"show bgp ipv6 neighbors $word advertised-routes\"" "ipv6.bgp.neighbor.$word.adv$asic_id"
         save_cmd "vtysh $ns -c \"show bgp ipv6 neighbors $word routes\"" "ipv6.bgp.neighbor.$word.rcv$asic_id"