[DCAEGEN2] Use common.log template

[DCAEGEN2] Use common.log template

Until now DCAEGEN2 used its own templates instead of common ones. This
change switches filebeat sidecar generation to common.log templates.
Other ONAP components already use it. Filebeat is depreceated and with
use of common templates it is possible to disable it globally.

This patch also changes ConfigMap usage from per component ConfigMap to
one ConfigMap for all of DCAEGEN2 components. This is done to simplify
generated file as there are no differences between per component
ConfigMaps.

Issue-ID: OOM-1
Signed-off-by: Maciej Wereski <m.wereski@partner.samsung.com>
Change-Id: I87ffe4890b9a4d79edfe0669750dbf21b4a7b340