RANGER-4385: Fix role filtering logic in RolePredicateUtil

[IOrzo]

What changes were proposed in this pull request?

Fix role filtering logic in RolePredicateUtil

How was this patch tested?

1. Create a new user with role USER in Ranger Admin
2. Create a role like this table

Role Name	Users	Groups	Roles
role_second	test	--	role_first

3. use this account to query through the role name parameter role_first