stub axios with sinon

[nonomoho]

Fix #13066

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[CLAassistant]

All committers have signed the CLA.

[pascalgrimaud]

@nonomoho : can you update your git config, to use your email, associated to your GitHub account ? Because the CLA is already signed with this :)

[nonomoho]

Bounty claimed

[pascalgrimaud]

With the link, it would be better @nonomoho :-D
But it's ok, I got the mail.

Approved ! Thanks for your contribution on Vue.js !

[nonomoho]

Sorry, thank you Pascal, thank you JHipster !