Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit 179553fdbecda05b421e1c28dac0ff4fd525cd41.
Revert "[maven-release-plugin] prepare release wso2-wss4j-1.5.11-wso2v7"

This reverts commit 679b07042e693179abfc5408206e6a02f641a3a2.