Run additionally a test with a package built for system rpm's ARCH
-target set to it).
Ignore an arch_compat test on ARM (the one introduced in 1.1.3-alt5:
build (<= 4.0.4-alt141) is not ideal yet.

Also test the compatibility between `uname -m`, rpmbuild, and rpm -i.
checkinstall subpkg does this.)
First, run a simple test (to fail fast).

To catch more errors:
upgradable in bad direction),

To catch more errors (evidenced by file conflicts during rpm -U),

(.spec) Factored out /usr/sbin/sh-safely (checkinstall-helper-sh-safely pkg)
In the tests, used the common /bin/tmpdir.sh (from tmpdir.sh pkg).

New tests for disttag comparison with the obsolete (.) and current format (+)
New tests for the %_priority_distbranch feature in normal situation.
The reasons of the currently XFAILing tests (with rpm-4.13.0.1-alt6):
standard configuration

Tests for upgradability according to the disttag. (XFAIL: incorrect
4.13.0.1-alt5, but different in 4.0.4-alt101.M80P.5;
standard configuration without honor_buildtime.)
Extended the tests for the overlapping of constraints and packages

More complete set of tests of the upgradability order

Test the upgradable order
Marked one of the new tests XFAIL: strict buildtime-based
4.13.0.1-alt5.

In disttag, use xxx (instead of zzz), because rpm-build-4.0.4-alt127
unaware rpm with packages
build.

Unmarked XFAIL: cases with underspecified Provides
4.13-alt6).
Marked XFAIL: non-critical unrealistic cases when obsoleting an exact disttag.

Additionally test the same things, but provided as virtual Provides
Implemented a checkinstall subpackage that runs these tests immediately.
Fixed running the tests from another working dir.

initial build for ALT Linux Sisyphus.