cloud_controller_ng: disk_quota incorrectly blocked using v3-apply-manifest

Please fill out the issue checklist below and provide ALL the requested information.

• I reviewed open and closed github issues that may be related to my problem.
• I tried updating to the latest version of the CF CLI to see if it fixed my problem.
• I attempted to run the command with CF_TRACE=1 to help debug the issue.
• I am reporting a bug that others will be able to reproduce.

Describe the bug and the command you saw an issue with NOTE: We have a custom disk_quota set to 4096 MB.

using cf push, I can push an app with this manifest specifying a disk_quota of 4096 MB:

---
applications:
- name: test-python-flask
  random-route: true
  buildpacks:
    - python_buildpack
  memory: 256M
  disk_quota: 4096MB

Using cf v3-apply-manifest -f ./manifest.yml, I get the error disk_quota too much disk requested (requested 4096 MB - must be less than 2048 MB)

What happened I get the error disk_quota too much disk requested (requested 4096 MB - must be less than 2048 MB)

Expected behavior I should be able to use the full disk quota allowed

To Reproduce Steps to reproduce the behavior; include the exact CLI commands and verbose output:

1. Have an environment with a custom maximum_app_disk_in_mb, higher than 2048MB
2. use cf v3-apply-manifest with a manifest requesting more than 2048MB, but less than maximum_app_disk_in_mb disk quota
3. See error

Provide more context

• Mac OS X 10.14 iTerm
• cf version 6.46.0+29d6257f1.2019-07-09
• 2.138.0

Note: As of January 2019, we no longer support API versions older than CF Release v284/CF Deployment v1.7.0 (CAPI Release: 1.46.0 (APIs 2.100.0 and 3.35.0).