ci-test: Add options to disable integration tests

Enable integration tests by default.
Give the user an option(--no-integration-tests) to disable them.

```
usage: unit-test.py [-h] -w WORKSPACE -p PACKAGE [-t]
                    [--integration-tests | --no-integration-tests] [-v]
                    [-r REPEAT] [-b BRANCH] [-n]
...
  --integration-tests   Enable integration tests [default].
  --no-integration-tests
                        Disable integration tests.
```

This is needed, because some tests are run for a certain period
that increases the test execution time.

Tested on pid-control and host-ipmid proposed integration tests
with/without this option.

Signed-off-by: Ramin Izadpanah <iramin@google.com>
Change-Id: I21656dcdf300d990fef8d387725813e0dd1827e1
1 file changed