TravisCI: Improvements

Fix warnings

Date: Wed, 4 Nov 2015 20:33:19 -0000
It would seem that it's standard practice not to include a newline in the message
text, but that results in poor formatting, as a shell's command line then begins
on the line of the error message itself.

This commit simply instructs `fatal()' to append a newline after the message,
which should be suitable behavior for all of the invocations I've come across.

Added missing Short-Description init info field to debian init script.

The Short-Description init info field is used by systemd and
displayed along with the service name. When it's missing the string
'null' is displayed instead.

matches

(option name has another option name as a prefix)

Support syslog logging in dbclient.

Client: kill proxy command when exiting application.

Implemented ExitOnForwardFailure option for local and remote forwarding.