adding http client to pom

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@176589 a5903396-d722-0410-b921-86c7d4935375
adding correct versions

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@176590 a5903396-d722-0410-b921-86c7d4935375