Resolve security issues

Resolve security issues

This change contains the following fixes:

1) Updated ccsdk/dashboard to use ONAP's oparent parent pom
2) Removed <version> tag from dependencies managed by oparent,
   where feasible (e.g. not spring, since oparent uses Spring 5
   and dashboard is based on Spring 4)
3) Updated versions of third party libraries as needed to address
   vulnerabilities found in nexus IQ scan.
4) Added missing license headers in source files to resolve
   checkstyle error from oparent.
5) Fixed indentation (tab -> 4 spaces) to resolve oparent
   checkstyle warning.

Change-Id: Ib92d5ef86dbdb78c270d0901cc0753cd5a78eb6e
Issue-ID: CCSDK-1167
Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>