[DCAEGEN2] Update datafile-app-server to 1.6.0

- docker base image to integration (from debian based to alpine based)
- java version bump from 11.0.8 to 11.0.9
- remove exec file permission for config file
- tomcat-embed-core version bump from 9.0.39 to 9.0.50
- spring version bump from 5.3.1 to 5.3.6
- spring-boot version bump from 2.4.0 to 2.4.5

Issue-ID: DCAEGEN2-2804
Signed-off-by: Joanna Jeremicz <joanna.jeremicz@nokia.com>
Change-Id: I3306cfd014dda48cdda5db9fa24c5048764c1ce8
2 files changed