CELIX-190: fixed memory leak in getIpAdress handling

git-svn-id: https://svn.apache.org/repos/asf/celix/trunk@1643059 13f79535-47bb-0310-9956-ffa450edef68
CELIX-190: fixed memory leak in port handling

git-svn-id: https://svn.apache.org/repos/asf/celix/trunk@1643070 13f79535-47bb-0310-9956-ffa450edef68
CELIX-192: add locking, fixed minor issues in export- and import-registration 

git-svn-id: https://svn.apache.org/repos/asf/celix/trunk@1643222 13f79535-47bb-0310-9956-ffa450edef68