test: query: show: status-of-installed-package: added
lib: system: state: removed obsolete/wrong field values handling

Remove long obsolete (hold, hold-reinstreq, removal-failed) or just
wrong (post-inst-failed vs postinst-failed) values, that have been
autoconverted by dpkg at run-time to their new equivalents, so there
should not be any such instance in any recent system (removal-failed
since dpkg 1.1.4 in Apr 1996, hold and hold-reinstreq since dpkg
1.2.0 in May 1996). dpkg even stopped doing the mapping in 1.15.4
and 1.15.8 respectively.

Signed-off-by: Eugene V. Lyubimkin <jackyf@debian.org>
lib: system: state: InstalledRecord: Status: strings: added strings for trigger-related states