renamed connector util method to lookupFunctionParam instead lookupTemplateParamater

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180672 a5903396-d722-0410-b921-86c7d4935375
changed api reference for class mediators funtion paramter invoke util method

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180675 a5903396-d722-0410-b921-86c7d4935375