Changing names of the default branch

[sgoggins]

Tooling needs to handle the changing of the default branch name on platforms like Github, where it is now main instead master.

Current tooling (Augur and Grimoirelab) will handle whatever the default branch was when we first cloned the repository. Most tools are not designed to handle default branch changes, but we will need to likely address this in the near future.

@dicortazar -- I don't think Augur will do this by default. Do you know how or if Grimoirelab handles this?

git branch -M will change the name of whatever branch you are on. I believe Augur will handle this change. But if the change involves creation of a new branch on GitHub and changing the default branch at the platform level, I still don't think Augur handles this ...

[sgoggins]

Testing needs to be performed to see how current CHAOSS tools handle these types of changes.

[GeorgLink]

Ping @sduenas and @vchrombie