[Fix][IDENTITY-1427] Make Tenant domain case insensitive

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/kernel/trunk@179307 a5903396-d722-0410-b921-86c7d4935375
[Fix][IDENTITY-1427] Make Tenant domain case insensitive

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/kernel/trunk@179308 a5903396-d722-0410-b921-86c7d4935375