Apigee X Quickstart - added MANAGED_DOMAIN_PREFIX parameter

[tyayers]

Description

• added a new parameter to the Apigee X Quickstart automation script to influence the nip.io domain for the managed option (better for demos to have api.[ip].nip.io instead of eval-group.[ip].nip.io)

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.
• [ ] PR requires full pipeline run (Run for changes only by default).

CC: @apigee-devrel-reviewers

[tyayers]

btw new parameter is optional, default handling is as before (env-group is used as domain prefix).

[danistrebel]

/gcbrun

[apigee-devrel-bot]

Pipeline Report

Pipeline	Result	Elapsed Wall Time
tools/apigee-x-trial-provision	pass	952s
TOTAL PIPELINE	pass	952s

View details in Cloud Build (permission required)

Commit version: b1f9ada

[danistrebel]

/gcbrun

[apigee-devrel-bot]

Pipeline Report

Pipeline	Result	Elapsed Wall Time
tools/apigee-x-trial-provision	pass	949s
TOTAL PIPELINE	pass	949s

View details in Cloud Build (permission required)

Commit version: b0be3ce