global: getting rid of jacoco-aggregator-maven-plugin

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
global: moving to a stable protoc maven plugin

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
global: moving towards stable coveralls-extensions-maven-plugin version

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
global: end of plugin stabilization

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