USN-6365-2: Open VM Tools vulnerability

USN-6365-1 fixed a vulnerability in Open VM Tools. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

It was discovered that Open VM Tools incorrectly handled SAML tokens. A
remote attacker could possibly use this issue to bypass SAML token
signature verification and perform VMware Tools Guest Operations.

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