removing hard coded gitblit admin user credentials

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179051 a5903396-d722-0410-b921-86c7d4935375
Fixed test failure

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179052 a5903396-d722-0410-b921-86c7d4935375