Add Travis-CI testing support

(cherry picked from commit e9224a7a7322bd828539b25b1d4a08c60b8fa9ae)
Rename /etc/rsyslog.d/10-crowbar-client.conf to 99-crowbar-client.conf

We want this to be the last config file; for instance, this should be
included after 11-swift.conf. Of course, we could rename 11-swift.conf,
but there might be other files.

(cherry picked from commit 293f7cd066472343d092b8f69ae6f384b561f2ba)
Merge pull request #94 from dirkmueller/release/stoney/master

Rename /etc/rsyslog.d/10-crowbar-client.conf to 99-crowbar-client.conf