Remove fixed hashes for integration test

[Mikerah]

As we recently merged in the basic structure for our integration tests, we need to think about how we can automatically keep track of the different commits for different repos. Starting this repo to keep track of the hashes and potentially ideate on how to handle this.

[sbc64]

I would like to mention that by default these fixed hashes are not on. They can be toggled on through the use of environment variables.

Here is a list of them: https://meson.hashcloak.com/docs/#environment-variables

And for now we care about these ones:

• REPOS_SERVER_GITHASH
• REPOS_AUTH_GITHASH
• TEST_CLIENTCOMMIT

I propose that this issue tracks how often we are forced to turn on these hashes in travis through the environment variables.