When Kibana interface is opened for the first time, it requires creating
a default index pattern. To view, analyse and search logs, at least one
index pattern has to be created.
This patch automate "flog-*" default index pattern creation and set it
has default config.

Partially-implements: blueprint default-kibana-dashboard
Change-Id: Ie36696f9ad38ba7e49e65e0793a3b98d9f03ee8d