Support sequencial test and skip run

[llun]

When write functional test, sometime it have to depend in sequencial run to make it add/delete easier in future but it make run test harder after add because it have to run prerequisite test before target. Embed prerequisite in Crosstest and add skip command or set may make it easier to run functional test and test target function easier.

[teerapap]

I'm not sure I understand your issue correctly but I've started re-implementing your suite runners to support flexible suite such as test sequences ,precondition and setting up/down required services. I plan to implement tag-based tests to handle the test inclusion/exclusion in the suite.

However, the efforts are suspended due to other important tasks.

[llun]

@teerapap currently ct already have sequence (it's in util.) but it's can't skip to run specific test. I want to run specific test in sequence that's my need.

However, precondition and tag-base test is interesting. I want to see that code.