Update failing tests due to change in grimoirelab-preceval repository

[aswanipranjal]

This PR updates the git data that is stored for the comparision with the fresh data fetched from the perceval repo.

WHY?:
The tests enrich grimoirelab-perceval git data to test the functions and by merging old PRs in perceval it changed the fresh data that was being fetched from the preceval repo and thus test were failing.

We are using git data source because in using github data source will result in long time for the tests to run as it requires a github token to query the data and we don't have one.

[coveralls]

Pull Request Test Coverage Report for Build 191

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 55.309%

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Totals
Change from base Build 189:	0.0%
Covered Lines:	849
Relevant Lines:	1535

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💛 - Coveralls

[aswanipranjal]

@jgbarah please have a look?

[jgbarah]

I'm approving the comment, but however, i think we need to improve how tests are done by either:

• Use "frozen" enriched indexes, that are uploaded to Elasticsearch before the test is run. Since the enriched index will always be exactly the same, output should be, too, or
• Use the Perceval cache, so that instead of going to the real data source, Perceval just gets the data that is previously feed in its cache, or
• Use a git repository in a tar file, so that before running the tests, the git repo is untarred and tools are run in it to produce the enriched index. This is particular to git.

Or maybe a combination of the above.

@aswanipranjal please open a new issue about this (although I'm merging this code, since it is better than what we had).

[aswanipranjal]

Thank you @jgbarah!
I will update the tests to use a frozen index, as I am trying to do in the tests for #80.