UserManager.isUserOfType

Replaces the UserManager.getUserType API with isUserOfType, where the
suspected type is passed in as a parameter. Also makes this API require
MANAGE_USERS.

Test: atest UserManagerServiceUserInfoTest
Test: atest UserManagerTest
Bug: 142482943
Change-Id: Icca1d5d9a36bfc1422c3f37456135ce69c3f3b38