test: add sovereign changeover tests

[MSalopek]

Description

Closes: #780

The scenario:
Run sovereign chain, create an upgrade prop and pass it. The chain halts when upgrade height is reached.
The sovereign chain does not create an IBC connection to provider.

Then, perform the upgrade procedure which will add ccv module to the sovereign chain.
After that, try to create IBC connections between sovereign (now a consumer using the provider valset it got from CCV genesis) and the provider.

At the moment this fails on adding an IBC connection (validator hash mismatch):

{chain=provi tracking_id=ConnectionOpenTry
}:send_tx_with_account_sequence_retry{chain=provi account.sequence=2
}:estimate_gas: failed to simulate tx. propagating error to caller: gRPC call failed with status: status: Unknown, message:
    "failed to execute message;
        message index: 0:
        cannot update client with ID 07-tendermint-0:
        trusted validators validators:<address:\"\\006\\300\\363\\344|\\305\\307H&\\220\\210\\334/6A\\035:\\252'\\306\" pub_key:<ed25519:\"F\\267%C?[\\\"\\031\\010\\313\\370\\037/\\2179\\203s\\3301\\350\\210\\222\\356*z\\216=\\347\\277;_]\" >
        voting_power:500 > proposer:<address:\"\\006\\300\\363\\344|\\305\\307H&\\220\\210\\334/6A\\035:\\252'\\306\" pub_key:<ed25519:\"F\\267%C?[\\\"\\031\\010\\313\\370\\037/\\2179\\203s\\3301\\350\\210\\222\\356*z\\216=\\347\\277;_]\" 
        > voting_power:500 > total_voting_power:500 ,
        does not hash to latest trusted validators.
        Expected: 632730A03DEF630F77B61DF4092629007AE020B789713158FABCB104962FA54F,
        got: D6D4CE2ACF857B920DD58E104ECBF02A5F9E48F295903522B8572E0077A04193:
        invalid validator set [cosmos/ibc-go/v4@v4.4.0/modules/light-clients/07-tendermint/types/update.go:156] With gas wanted: '0' and gas used: '80984' ",
        details: [], metadata: MetadataMap {
        headers: {
            "content-type": "application/grpc",
            "x-cosmos-block-height": "37"
        }
}

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[MSalopek]

Putting this on ice until ICSv3 is out.

[MSalopek]

Superceeded by #1025