ltp-networking/tcp_cmds/finger: finger an unknown host test will return
1 even if execution success on Ubuntu 12.04

for example:
    $ finger @xxxx || echo "test fail"
    finger: unknown host: xxxx
    getaddrinfo: No address associated with hostname
    test fail
ltp-networking/tcp_cmds/netstat: netstat cmds will return 1 even if no
output in stderr on Ubuntu 12.04

for example:
    $ netstat -s 1>netstat/dev/null 2>&1 ; echo $?
    1

This if condition would have worng result.
    if ! netstat $flag 1>/dev/null 2>&1; then
        end_testcase "netstat $flag failed"
    fi
ltp-networking/tcp_cmds/tcpdump:
1. RHOST IP won't appear in network interfaces. It should be LHOST.
2. Host commad can't fetch IP in no DNS enviroment. use ping intead of
   it
ltp-networking/iproute:
ip02: set original mtu size back. this test will set mtu to 300.
ip05: if there is nott only one route using "head" command will get
      wrong result.
ltp-networking/iptables: "iptables -L -t nat" lists 4 chains not
3 chains on Ubuntu 12.04
ltp-networking: standardize test result message
ltp-networking/rpc: gave precise test name