java-toolkit-ci: cleanup

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
java-toolkit-ci: less strict jacoco dir property

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
global: skip coveralls report on non-ci environment

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
java-toolkit-ci: migrating to jacoco-aggregator-maven-plugin

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>