WooCommerce_Services: Set the Jetpack object with the jetpack_loaded action

[kbrown9]

Currently, the WC_Services_Installer class calls Jetpack::init() when the file is loaded. Jetpack::init() should be called only after all of the plugins have been loaded. To fix this, set the Jetpack instance using the jetpack_loaded action hook, which provides the Jetpack object after all of the plugins have been loaded.

Changes proposed in this Pull Request:

• Set the Jetpack instance using the jetpack_loaded action hook.

Is this a new feature or does it add/remove features to an existing part of Jetpack?

• This changes an existing part of Jetpack.

Testing instructions:

We'll test this by checking that the WooCommerce Services plugin is successfully installed via the JITM.

Test Site Setup

• Jetpack must be installed, activated, and connected.
• WooCommerce must be installed and activated.
• WooCommerces Services must not be installed.

Test Steps

1. On wp-admin, navigate to WooCommerce -> Orders.
2. You should see a JITM at the top of the page with an "INSTALL WOOCOMMERCE SERVICES" button. Click that button to install the WooCommerce Services plugin.
3. Navigate to Plugins and ensure that the WooCommerce Services plugin was successfully installed and activated.

Proposed changelog entry for your changes:

• tbd

[jetpackbot]

Thank you for the great PR description!

When this PR is ready for review, please apply the [Status] Needs Review label. If you are an a11n, please have someone from your team review the code if possible. The Jetpack team will also review this PR and merge it to be included in the next Jetpack release.

Scheduled Jetpack release: January 14, 2020.
Scheduled code freeze: January 7, 2020

Generated by 🚫 dangerJS against 12a593d

[jeherve]

It seems to work in my tests. 🚢