R_s2, PT hostname, and syslog-ng version & certs

* upgraded to remote_syslog2
* Papertrail hostname is now configurable
* syslog-ng has been upgraded to 3.3.5-r1
* now uses new certificate bundle
Merge pull request #1 from leonsodhi/papertrail-upgrade-and-fix

R_s2, PT hostname, and syslog-ng version & certs