No easy way to skip a Test

[Federico Razzoli]

This is a feature request received by Federico in a private conversation.

Now, to skip a test, one should DROP it and re-create it when he wants to enable it; or replace it with a test with the same name which does nothing.

We should implement stk_unit.ignore_test(tc)

In the TR summary, number of ignored BTs should appear. In the report, their names should appear.

[Federico Razzoli (santec)]

Following Procedures will be added:

1) base_test_skip(tc, bt)
2) base_test_unskip(tc, bt)

1) must return errors if:
* tc not exists
* bt not exists in tc

2) must return errors if:
* tc not exists
* bt not exists in tc
* is not currently skipped

[Federico Razzoli (santec)]

Skipped BTs must be catched by a different query+cursor, so that we dont slow down the main cursor (which is already slow).