E2E: add a setup script that mines a block.

[kvagajack]

Two purposes

• avoid too-long-mempool-chain error;
• maintain balance on address from where we send coins to the test users.

TODO The script should be run for e2e on Travis (.travis.yml) during before_install, right after it starts wallet-api. The script should check the current size of the mempool and generate a block sending the reward to the qa user which we use to send funds to test users (think whether this user should be stored among the seed data inc keys, etc).

APIs to use

• https://api-qa-wallet.equibitgroup.com/proxycore?node=eqb&method=getrawmempool
• https://api-qa-wallet.equibitgroup.com/proxycore?node=eqb&method=generatetoaddress[]=1[]=n4hos8JsKDQpyF5vMt8rKTfo4cpwVr2qo6 (Note: replace the address with the correct one)

Cases

• EQB
• BTC

Related

• check https://github.com/Equibit/wallet-ui/pull/1131