Add a flag for authenticating unverified users
 - defaults to true

[#82966572] https://www.pivotaltracker.com/story/show/82966572

Signed-off-by: Madhura Bhave <mbhave@pivotal.io>
Add mockmvc tests for testing allowUnverifiedUsers flag
 - Remove systemProperty for the same from build.gradle

Signed-off-by: Madhura Bhave <mbhave@pivotal.io>
Delete unused file

Signed-off-by: Madhura Bhave <mbhave@pivotal.io>
Merge branch 'feature/allow_unverified_users_to_login' into develop