fix for REGISTRY-2230

[1] https://wso2.org/jira/browse/REGISTRY-2230

Please note that <rampart.wso2.version> is set to 1.6.1-wso2v13-SNAPSHOT, which should be set to is set to 1.6.1.wso2v13-SNAPSHOT. This is because 1.6.1.wso2v13-SNAPSHOT is not available in nexus repositories. 
Darshana of IS team recomended to use 1.6.1-wso2v13-SNAPSHOT instead and change it to 1.6.1.wso2v13-SNAPSHOT once it is available in nexus.