We bind flag that could be specified in config.
This is not a config flag, just a command option.
Also fix TestInitialize failures:
```
Error: Received unexpected error:
number of epochs cannot be less than 1
Test: TestInitialize/16_nodes/force-new-epoch
```
Refs #1372 (945b7c740b)
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
