remove sed usage for bsc cluster

[Mister-EA]

In this PR the script for deploying a local BSC cluster is refactored, so thatsed is not longer used to modify the genesis contract templates, or the generated config.toml files from the initNetwork command .

Because of the changes from the following 2 PRs the correct contracts and config.toml can directly be generated without modifying any files from the scripts in this repo.

• Support local deployment bsc-genesis-contract#371
• Update init-network command bsc#1839

Now all the user has to do is edit the following files to configure the deployment:

• genesis/genesis-template.json
• config.toml
• .env

Since the changes in BSC and bsc-genesis-contract have not been merged yet, you need to use the following branches to test the deployment flow:

• toml-settings branch for BSC
• support-local-deployment for bsc-genesis-contract