dev: tests: fix typo in spec file
dev: test: Add script that runs the unit tests
high: parse: Fix sequential=true for resource sets (bnc#862334)

The following construction does not work as intended:

order o1 Mandatory: [ A B sequential=true ] C

In this case, since require-all is set to false (the brackets) and sequential
is explicitly set to true, the sequential attribute is lost and is not applied
to the resulting resource set.