Can't check if vshard is bootstrapped

[mRrvz]

Now, in the cartridge replicasets command we have no way of knowing whether vshard is bootstrapped. If I have to check if vshard is bootstrapped, I need to type command cartridge replicasets bootstrap-vshard - if so, I will get an error, but otherwise it will simply be loaded. What if I don't want it?

Maybe we can add an additional command for this purpose? For example, add cartridge replicasets vshard command, which will have two options:

• bootstrap (the same as cartridge replicasets bootstrap-vshard now)
• status