twister: fix handling of mixed str/list configurations
We can now have situations like this when it comes to lists in Twister
config:
```yaml
common:
platform_exclude: foo
tests:
my.test:
platform_exclude: bar
```
```yaml
common:
platform_exclude: foo
tests:
my.test:
platform_exclude:
- bar
- baz
```
```yaml
common:
platform_exclude:
- foo
- bar
tests:
my.test:
platform_exclude: baz
```
```yaml
common:
platform_exclude:
- foo
- bar
tests:
my.test:
platform_exclude:
- baz
- bazz
```
This patch fixes handling of cases (2), (3) and (4).
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
1 file changed
