ignore .checkstyle and .externalToolBuilders for eclipse (#3212)
ignore .checkstyle and .externalToolBuilders for eclipse (#3212)


apache/skywalking,ascrutae/sky-walking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,OpenSkywalking/skywalking,ascrutae/sky-walking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,apache/skywalking,apache/skywalking,OpenSkywalking/skywalking