Skip git repo check by default in Commands which do not rely on git

[noherczeg]

According to Bootstrap Command's description it is not necessarily true that we need to check if the command was run in a project where there is a pre-initialized git repository. This PR tries to resolve this issue.

Description

I added a --skip-git-check flag to the Bootstrap Command which is on by default resulting in a behavior described above

Motivation and Context

#438

How Has This Been Tested?

I added integration tests.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[evocateur]

Basically, this isn't really something that needs to be configurable by users; a command either requires git or it doesn't. I think we can get more clarity (and keep the CLI less noisy) with an opt-out subclass getter method override.

[evocateur]

I'd rather this was some sort of class property optionally overridden (kinda like the otherCommandConfigs() getter) when a command requires git. The base class has get requiresGit() { return true; }, and various commands that don't need git can opt-out by overriding the getter method.

[noherczeg]

I'll update the PR in the evening. Thanks for the feedback!

[evocateur]

Awesome, thanks @noherczeg!

[shospodarets]

Hey @noherczeg , thanks for revisiting this.
In my case we use Git for development, but then deliver project for the customers, which can use anything.
In that case we want to avoid "lerna botstrap" to throw an error "This is not a git repository" as it still may be fully functional without it.
I tried you solution with version 2.0.0-rc4, but seems still there is a problem:

> lerna "bootstrap" "--skip-git-check"

lerna info version 2.0.0-rc.4
lerna ERR! ENOGIT This is not a git repository, did you already run `git init` or `lerna init`?

Or it's supposed to be available in rc5?

[evocateur]

Yep, this has not been released yet.

[lock]

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