Update Maven plugins

Update Maven plugins

- build-helper-maven-plugin 3.0.0
- eclipse-jarsigner-plugin 1.1.5
- jacoco-maven-plugin 0.8.1
- maven-clean-plugin 3.1.0
- maven-jar-plugin 3.1.2
- maven-pmd-plugin 3.10.0
- maven-resources-plugin 3.1.0
- maven-shade-plugin 3.1.1
- maven-site-plugin 3.7.1
- maven-surefire-plugin 2.21.0
- maven-surefire-report-plugin 2.21.0
- plexus-compiler-javac 2.8.4
- spotbugs-maven-plugin 3.1.3.1
- tycho 1.2.0 (leftover)
- wagon-ssh 3.1.0

Change-Id: I8eba2ee448437a775542ef6a7c59661727aa207c
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>