Apigee edge to x migration

[kurtkanaskie]

Description

Added self service tools and scripts to migrate Apigee Edge to Apigee X.

Housekeeping

(please check all that apply [x], do not edit the text)

• [X] I have run all the tests locally and they all pass.
• [X] I have followed the relevant style guide for my changes.

ADVANCED Settings

For most PRs you most likely do not have to edit anything in this section.

Test Scope

There are no automated tests.

CC: @apigee-devrel-reviewers