This starts with a very simple test for `osctl version` using regexps as
output of the command depends a lot on current version.
We might use more of 'gold' matches for other commands potentially.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
This is just first steps and core foundation.
It can be used like:
```
make integration.test
osctl cluster create
build/integration.test -test.v
```
This should run the test against the Docker instance.
Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
