[Bug 1670449] [NEW] Trove guest agent has postgres 9.4 configuration template. Ubuntu 16 database guests support only postgres 9.5

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---Problem Description---
checkpoint_segment parameter in Trove configuration template prohibits postgres9.5 from starting. It needs to be removed. 

The name of the .pid file changes in postgres9.5 and needs to be changed
accordingly in trove code

Trove checks first for upstart to start/stop database service and if exist, doesn't check for systemd files. can not start all postgres services with init . It needs to check first for systemd to start/stop database service.
 
---uname output---
Linux zhyp169 4.4.0-47-generic #68-Ubuntu SMP Wed Oct 26 19:42:36 UTC 2016 s390x s390x s390x GNU/Linux
 
Machine Type = KVM guest on s390 lpar 
  
---Steps to Reproduce---
1. Create an Ubuntu 16.04 database image for postgresql
2. Add a postgresql datastore to your OpenStack Trove environment
3. Launch a DB instance using this image and this datastore for postgresql
 
Userspace tool common name: trove guest agent 
 
Userspace package: trove-guestagent

** Affects: openstack-trove (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-152269 severity-critical targetmilestone-inin16042
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Trove guest agent has postgres 9.4  configuration template. Ubuntu 16 database guests support only postgres 9.5
https://bugs.launchpad.net/bugs/1670449
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