policycoreutils: pp: add roletype statements for both declared and required type/typeattributes

Currently, roletype statements are only added for types when they are
declared (not required). This means that in policy like:

  require {
    type foo_t;
  }
  type bar_t;
  role staff_r types foo_t, bar_t;

only bar_t is associated with staff_r. This patch moves the code that
generates roletype statements for types to outside the SCOPE_DECL check
so that roletype statements are generated for all types, regardless of
the required/declared scope. It further moves the code outside of the
type/typeattribute flavor check so that roletype statements are also
generated for typeattributes.

Reported-by: Sven Vermeulen <sven.vermeulen@siphos.be>
Signed-off-by: Steve Lawrence <slawrence@tresys.com>
Reviewed-by: Yuli Khodorkovskiy <ykhodorkovskiy@tresys.com>
Tested-by: Jason Zaman <jason@perfinion.com>
semanage_migrate_store: Python3 support

Mainly used the 2to3 conversion tool. Also added in a __future__
import so that the script continues to work on Python 2.

Tested on 2.7, 3.3, 3.4. Should work on 2.6 too but untested.

Signed-off-by: Jason Zaman <jason@perfinion.com>
Acked-by: Steve Lawrence <slawrence@tresys.com>