Steal code from mysqlsniffer (http://hackmysql.com/mysqlsniffer) for special parsing of MySQL packets.

Steal code from [mysqlsniffer](http://hackmysql.com/mysqlsniffer) for special parsing of MySQL packets.

This addresses #31.

Results of running tests...

```
~/dev/git-repos/tcpdump$ make check
(cd tests && ./TESTrun.sh)
reading from file lmp.pcap, link-type EN10MB (Ethernet)
lmp.sh: passed.
reading from file print-flags.pcap, link-type EN10MB (Ethernet)
reading from file print-flags.pcap, link-type EN10MB (Ethernet)
reading from file print-flags.pcap, link-type EN10MB (Ethernet)
reading from file print-flags.pcap, link-type EN10MB (Ethernet)
reading from file print-flags.pcap, link-type EN10MB (Ethernet)
reading from file print-flags.pcap, link-type EN10MB (Ethernet)
print-flags.sh: passed.
    bgp_vpn_attrset: passed.
    eapon1: passed.
    esp0: passed.
    esp1: passed.
    esp2: passed.
    esp3: passed.
    esp4: passed.
    esp5: passed.
    espudp1: passed.
    isakmp1: passed.
    isakmp2: passed.
    isakmp3: passed.
    isakmp4: passed.
    mpls-ldp-hello: passed.
    ospf-gmpls: passed.
    ikev2four: passed.
    ikev2fourv: passed.
    ikev2fourv4: passed.
    ikev2pI2: passed.
    dio01: passed.
    e1000g: passed.
    forces01: passed.
    forces01vvv: passed.
    forces01vvvv: passed.
    qinq: passed.
    qinqv: passed.
    sflow1: passed.
    babel1: passed.
    babel1v: passed.
    babel_auth: passed.
    pppoe: passed.
    icmpv6: passed.
    spb: passed.
    ripv1v2: passed.
    ripv2_auth: passed.


   0 tests failed
  37 tests passed

```

Here's the sample output I get from doing a query `SELECT * FROM people` which returns 1 row with my first and last name from a `people` table in a database called `scratch_db`:

```
~/dev/git-repos/tcpdump$ sudo ./tcpdump -vv -i lo0 port 3306
tcpdump: listening on lo0, link-type NULL (BSD loopback), capture size 65535 bytes
14:56:23.102466 IP (tos 0x8, ttl 64, id 31372, offset 0, flags [DF], proto TCP (6), length 77, bad cksum 0 (->c214)!)
    localhost.64434 > localhost.mysql: Flags [P.], cksum 0xfe41 (incorrect -> 0x97f7), seq 2776885912:2776885937, ack 824077453, win 40830, options [nop,nop,TS val 1983598529 ecr 1983495289], length 25ID 0 len 21 COM_QUERY: SELECT * FROM people

14:56:23.102501 IP (tos 0x8, ttl 64, id 28631, offset 0, flags [DF], proto TCP (6), length 52, bad cksum 0 (->cce2)!)
    localhost.mysql > localhost.64434: Flags [.], cksum 0xfe28 (incorrect -> 0xb643), seq 1, ack 25, win 65535, options [nop,nop,TS val 1983598529 ecr 1983598529], length 0
14:56:23.102689 IP (tos 0x8, ttl 64, id 2039, offset 0, flags [DF], proto TCP (6), length 229, bad cksum 0 (->3412)!)
    localhost.mysql > localhost.64434: Flags [P.], cksum 0xfed9 (incorrect -> 0xd2a6), seq 1:178, ack 25, win 65535, options [nop,nop,TS val 1983598529 ecr 1983598529], length 177ID 1 len 1 ::Unhandled Event:: ::Unhandled Event:: Client pkt has no valid handler ::DUMP:: 02 ::DUMP::
	ID 2 len 64 COM_QUERY: def
scratch_dbpeoplepeople
first_name
first_name
          !
	ID 3 len 62 COM_QUERY: def
scratch_dbpeoplepeople	last_name	last_name
                                                 !
	ID 4 len 5 End <warnings 0> 
	ID 5 len 16 COM_FIELD_LIST: Marc
Abramowitz
	ID 6 len 5 End <warnings 0> 

14:56:23.102713 IP (tos 0x8, ttl 64, id 9207, offset 0, flags [DF], proto TCP (6), length 52, bad cksum 0 (->18c3)!)
    localhost.64434 > localhost.mysql: Flags [.], cksum 0xfe28 (incorrect -> 0x166d), seq 25, ack 178, win 40741, options [nop,nop,TS val 1983598529 ecr 1983598529], length 0
```