Changed sample users usernames to email format.
Changed sample users usernames to email format.

wso2-extensions/identity-cloud,Minoli/identity-cloud,Minoli/identity-cloud,sajithab/identity-cloud,malithie/identity-cloud,malithie/identity-cloud,wso2-extensions/identity-cloud,sajithab/identity-cloud,Minoli/identity-cloud,sajithab/identity-cloud,malithie/identity-cloud,malithie/identity-cloud,wso2-extensions/identity-cloud,sajithab/identity-cloud