getUserPropertiesCopy handles Query/Manage perms

getUserPropertiesCopy should use the standard way of querying whether a
caller has Query or Manage users permission. In particular, a caller
that has Manage should be treated as though it has Query as well, which
this cl will ensure. Some variable names and comments are updated to
make this clearer.

Test: atest UserManagerServiceUserPropertiesTest
Change-Id: I6ba312b27e6ab47498a03ecac6c1ffd6f60442e8