packagers: yum: do not use yum state strings

the yum.i18n produces non standard string encoding, encoded using ansi
codec but has unicode string, while the locale environment is set to
unicode, and python does enforce proper unicode in string.format().

the solution is to provide our own translation table for transaction
status, as no [simple] way was found to convert the non standard format
into unicode.

Change-Id: If230a17799263e705f194f180af04bf2904a5d90
Reported-By: Jakub Bittner <j.bittner@nbu.cz>
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>