use multierror in library

[yangcao77]

Signed-off-by: Stephanie yangcao@redhat.com

What does this PR do?:

This PR gets the latest commit from api repo which contains a bug fix for command validation.
This PR updates library validator to use multierrors as well, this guarantees the error received by tools will be well constructed.

Which issue(s) this PR fixes:

devfile/api#577

PR acceptance criteria:

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened.

• Open new test/doc issues under the devfile/api repo
• Check each criteria if:
• There is a separate tracking issue. Add the issue link under the criteria
  or
• test/doc updates are made as part of this PR
• If unchecked, explain why it's not needed

• Unit/Functional tests

• QE Integration test

• Documentation

• Client Impact

How to test changes / Special notes to the reviewer:

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kim-tsao, yangcao77

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• OWNERS [kim-tsao,yangcao77]

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