Merge lp://qastaging/~louis/charms/trusty/rsyslog-forwarder-ha/add_forward_hosts into lp://qastaging/charms/trusty/rsyslog-forwarder-ha

Hello Louis,

Thank you for submitting this fix.

I deployed this charm on the following environment:

[Environment]
UPGRADE-AVAILABLE
1.25.6

[Services]
NAME STATUS EXPOSED CHARM
external active false cs:xenial/ubuntu-8
rsyslog-forwarder-ha false local:trusty/rsyslog-forwarder-ha-0
ubuntu active false cs:trusty/ubuntu-8

[Units]
ID WORKLOAD-STATE AGENT-STATE VERSION MACHINE PORTS PUBLIC-ADDRESS MESSAGE
external/0 active idle 1.25.5.1 4 10.5.0.41 ready
ubuntu/3 active idle 1.25.5.1 5 10.5.0.42 ready
  rsyslog-forwarder-ha/0 unknown idle 1.25.5.1 10.5.0.42

[Machines]
ID STATE VERSION DNS INS-ID SERIES HARDWARE
0 started 1.25.5.1 10.5.0.37 d459cd19-5ea2-4d96-b187-13fc8e4117af xenial arch=amd64 cpu-cores=1 mem=1536M root-disk=10240M availability-zone=nova
4 started 1.25.5.1 10.5.0.41 82aac885-f27b-450f-a221-a6c65c68104a xenial arch=amd64 cpu-cores=1 mem=1536M root-disk=10240M availability-zone=nova
5 started 1.25.5.1 10.5.0.42 813f9b99-bdeb-4a6f-8838-546720998853 trusty arch=amd64 cpu-cores=1 mem=1536M root-disk=10240M availability-zone=nova

Then I related ubuntu with rsyslog-forwarder-ha, and then I did set the forward_hosts option:

ubuntu@niedbalski-bastion:~$ juju set rsyslog-forwarder-ha forward_hosts=external=10.5.0.41

The resulting configuration looks like:

$ActionQueueType LinkedList # use asynchronous processing
$ActionQueueFileName external # set file name, also enables disk mode
$ActionResumeRetryCount -1 # infinite retries on insert failure
$ActionQueueSaveOnShutdown on # save in-memory data if rsyslog shuts down

# Forward everything

*.* @10.5.0.41:514

The logs are being forwarder to the remote rsyslog server, I did run the lint/tests
also. All seems good.

LGTM.