SWE-22 / SP-641: build 'authentication', 'dbmigration', 'openbis_api' with gradle

authentication/build.gradle

authentication/gradle/wrapper/gradle-wrapper.jar

authentication/gradle/wrapper/gradle-wrapper.properties

authentication/gradlew

authentication/gradlew.bat

authentication/settings.gradle

common/build.gradle

common/gradle/wrapper/gradle-wrapper.properties

dbmigration/build.gradle

dbmigration/gradle/wrapper/gradle-wrapper.jar

dbmigration/gradle/wrapper/gradle-wrapper.properties

dbmigration/gradlew

dbmigration/gradlew.bat

dbmigration/settings.gradle

gradle/javaproject.gradle

openbis_api/build.gradle

openbis_api/gradle/wrapper/gradle-wrapper.jar

openbis_api/gradle/wrapper/gradle-wrapper.properties

openbis_api/gradlew

openbis_api/gradlew.bat