Display data based on read configuration file from ssh sessions
usr = raw_input("Enter username for " + server.address + ": ")
    pwd = getpass.unix_getpass("Enter passphrase for " + server.address + ": ")
    con = paramiko.SSHClient()


I'd avoid using abbreviations. Call them username and password and connection. You don't gain anything using abbreviations and it reduces readability.

    for session in sessions:

for server in sessions:


Are they servers or sessions? 

I'd also move the contents of the loop into methods on your session objects.