Connect to Cisco ASA

connect_cisco.py

```python
#!/usr/bin/env python

from netmiko import ConnectHandler
from getpass import getpass

ip_address = raw_input("Enter IP address: ")
username = raw_input("Enter username: ")

device = {
    'device_type': 'cisco_asa',
    'ip': ip_address,
    'username': username,
    'password': getpass('Enter SSH password: '),
    'secret': getpass('Enter enable password: '),
    'port': 22,
}

net_connect = ConnectHandler(**device)
output = net_connect.send_command_expect('show version')
print output
```

Ref: 
    https://github.com/ktbyers/netmiko/blob/master/netmiko/base_connection.py
    https://github.com/ktbyers/netmiko/issues/157