Fix project creation

[Pocokwins]

Identify google_project based on it's identifier provided by the remote client.
-->
Fixes #8

I have:

• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

I've created an image locally, which I pushed to our private repository, then I've used it in the Provider. After that I had to set up the projectId parameter for the Project resource and it has been created properly by the provider.

[ulucinar]

Thank you @Pocokwins for fixing this bug, lgtm. Also left a comment here and manually verified config.IdentifierFromProvider.

We also need to fix the Project example but looks like it's already broken (missing a required name parameter). I'll open a separate PR. Looks like we can also improve the appengine.Application example, which is currently missing a Project dependency.

[ulucinar]

Looks like we need a rebase and resolve conflicts. Will do so to make sure the fix is available with the next release.

[ulucinar]

Hi @Pocokwins,
Looks like I don't have permissions to push into your feature branch:

remote: Permission to XXXLutz/provider-gcp.git denied to ulucinar.
fatal: unable to access 'https://github.com/XXXLutz/provider-gcp/': The requested URL returned error: 403

Could you please rebase this PR?

[Pocokwins]

Hi @Pocokwins, Looks like I don't have permissions to push into your feature branch:

remote: Permission to XXXLutz/provider-gcp.git denied to ulucinar.
fatal: unable to access 'https://github.com/XXXLutz/provider-gcp/': The requested URL returned error: 403

Could you please rebase this PR?

Hi @ulucinar , sure, it's done.