Link DCAE MOD design tool to Acumos Adapter

Link DCAE MOD design tool to Acumos Adapter

Add import item to global menu with choices of import models, component specs,
and data formats.

Add prefix to acumos adapter API for consistency with rest of DCAE MOD and to
allow adding acumos adapter to k8s/rancher ingress or other reverse proxy
mechanism so it can be accessed by browser javascript in the design tool.

Remove dcae mod hostname mechanism for callbacks from browser javascript since
browser security only allows javascript to call back to the originating host
port.

Clean up indentation only differences between original NiFi code and ONAP
versions.

Remove 3 ONAP java files that are now identical to original NiFi versions.

Change-Id: I23bbd98d5b171d624ef35088cd821aff2918fc1b
Issue-ID: DCAEGEN2-1860
Signed-off-by: Andrew Gauld <agauld@att.com>