policycoreutils/semanage: improve compatibility with Python 3

- gettext.install() only takes "unicode" keyword argument in Python 2
- __builtin__ module has been renamed to "builtins" in Python 3
- use reserved word `as` in try-except
- replace print statement with print function

Signed-off-by: Michal Srb <msrb@redhat.com>
2 files changed