Introduce user types

Introduces the notion of 'user types' to UserManager.
Previously, users only had properties, set by UserInfo flags. We now
solidify some of these as formal user types. Each user must be of
precisely one user type. The configuration of each type is defined
in a UserTypeDetails object.

Prior 'types' - namely Guest, Restricted, ManagedProfiles, Demo, and
'normal' - that were set via UserInfo flags are now controlled via
UserType. Previous UserInfo flag methods for categorizing these are
still supported as long as no user of of more than one type.

If a user was (e.g.) previously both Guest and Demo, it is now
invalid and will be prevented from upgrading. This should not be a
problem in AOSP, where these 'types' were assumed mutually exclusive.

UserTypeDetails is sufficiently general to support future non-managed
profiles. To this end, the logic for specifying badges and their
colors/labels is contained by UserTypeDetails, and therefore
UserManager is responsible for delivering the corresponding badge
information.

Bug: 142151520

Test: added new test class UserManagerServiceUserTypeTest
Test: added additional tests in UserManagerServiceUserInfoTest
Test: added additional tests in UserManagerTest
Test: added additional tests in UserManagerServiceCreateProfileTest
Test: created UserTests to run the various pm.User*Test's

Test: atest \
  com.android.server.pm.UserTests \
  UserLifecycleTests \
  ManagedUserContentResolverTest \
  CtsDevicePolicyManagerTestCases \
  CtsMultiUserHostTestCases \
  com.android.server.devicepolicy.DevicePolicyManagerTest \
  com.android.server.am.UserControllerTest \
  CreateManagedProfileTaskTest

Test: atest com.android.server.pm.UserManagerServiceCreateProfileTest
   using adb shell getprop persist.sys.max_profiles # for 5 and -1

Change-Id: Id1183a76055e9a7610965cf40b256d1392afe6f8