chore: switch to integration-test-loader

[justmoon]

Currently, we have to bump the version of integration tests on every module, every time we change them. We also often get into deadlocks we have to resolve by skipping tests.

This is part of a series of pull requests to switch to five-bells-integration-test-loader, which will solve both problems by loading the integration tests according to the same rules as other modules: Use latest master, unless there is a branch of the same name, then use that branch.

It's probably easiest to understand by looking at the following two links:

• interledgerjs/five-bells-ledger@b241d14768b02a42a34dc42e91d5101db7de0525
• https://github.com/interledgerjs/five-bells-integration-test-loader

[codecov-io]

Current coverage is 99.11% (diff: 100%)

Merging #69 into master will not change coverage

@@             master        #69   diff @@
==========================================
  Files             3          3          
  Lines           225        225          
  Methods          33         33          
  Messages          0          0          
  Branches         58         58          
==========================================
  Hits            223        223          
  Misses            2          2          
  Partials          0          0          

Powered by Codecov. Last update 3e7db6c...54ea6b4