NO-JIRA: vendor: Update github.com/ldap/go-ldap/v3

[tchap]

The updated version contains Client.Unbind method that is needed.

To make the update work, had to align a fake LDAP client, or rather extend it with new methods.

Required by openshift/oc#2094

[openshift-ci-robot]

@tchap: This pull request explicitly references no jira issue.

In response to this:

The updated version contains Client.Unbind method that is needed.

To make the update work, had to align a fake LDAP client, or rather extend it with new methods.

Required by openshift/oc#2094

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[p0lyn0mial]

we usually keep vendor changes in a separate commit.
it is just easier to review as we don't have to review changes to the vendor dir.

please split the commit into two, one with the vendor changes and the other one with changes to the lib-go

[p0lyn0mial]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: p0lyn0mial, tchap

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[openshift-ci]

@tchap: all tests passed!

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