Display proper gateway length in health check result (#6226)

The output always returns 1 since all gateways are present in one line
but the actual output should be the number of gateways present
in that line

Co-authored-by: Rakesh Venkatesh <rakeshv@apache.org>

Author: ravening

systemvm/debian/root/health_checks/gateways_check.py

@@ -44,7 +44,7 @@ def main():
             unreachableGateWays.append(gw)
 
     if len(unreachableGateWays) == 0:
-        print "All " + str(len(gws)) + " gateways are reachable via ping"
+        print "All " + str(len(gwsList)) + " gateways are reachable via ping"
         exit(0)
     else:
         print "Unreachable gateways found-"