exocom: update register / disconnect logs

[charlierudolph]

Currently register and disconnect logs look like this:

ExoCom online at port 80
'bank-service' registered
'web-service' registered
'counterparty-service' registered
'bank-customer-service' registered
'trade-service' registered
'password-authentication-service' registered
'security' registered
'web-service' registered
'web-service' disconnected
'web-service' registered
'session-service' registered
'user-service' registered
'web-service' disconnected

Update so it adds the service id:

'web-service' registered (<id>)
'web-service' disconnected (<id>)