#3003 osaf: etcd.plugin should detect if etcd is down

[Gary Lee]

etcd.plugin (etcd v2) should detect that the etcd server has disconnected, and notify rded so it can fence the node.

See [#2997] for etcd v3

[Gary Lee]

commit d15ccea07385c89ae24fe44a66f3066e9a41e5b8
Author: Gary Lee gary.lee@dektech.com.au
Date: Tue Jan 29 10:31:54 2019 +1100

osaf: update sample plugin [#3003]

commit 9cb1a11f199faa965287dd17475a82cfd05f36a8
Author: Gary Lee gary.lee@dektech.com.au
Date: Tue Jan 29 10:31:54 2019 +1100

osaf: update etcd v2 plugin [#3003]

'etcdctl watch' will return if connection to the etcd server is lost.
If that occurs, send a 'fake' takeover request to rded so rded
will reboot the node. This is in alignment with the etcd v3 plugin.