Hastexo-xblock

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* [Enhancement] Use full names for common.djangoapps imports from
edx-platform.
* [Enhancement] Update requirements for Open EdX Koa release.
* [Bug fix] Fix two missing defaults in the Stack model.

---------------------------
* [Bug fix] Update test dependencies to address
[CVE-2021-3281](https://nvd.nist.gov/vuln/detail/CVE-2021-3281).
* [Enhancement] Add logging to provider actions, to make interactions
with cloud platforms more easily traceable.

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* [Bug fix] Make Paramiko SSH connections more robust against socket
timeouts (and retry the connection if it runs into one).

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* [DEPRECATION] As of this release, the previous implementation that
relied on the Guacamole Tomcat servlet is deprecated. A `stable-4.1`
branch exists that might still receive bugfixes for some time, but
do not count on this being supported any longer than the lifetime of
the Open edX Koa release. The [Ansible
playbooks](https://github.com/hastexo/edx-configuration/tree/hastexo/juniper/hastexo_xblock)
that tie into `edx-configuration` have been updated to “do the right
thing” based on the hastexo XBlock version being deployed: for
version 5 and up, they deploy Daphne and pyguacamole; for earlier
versions, they continue to deploy Tomcat and the Guacamole servlet.

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* [Bug fix] Add a default `port` value for `rdp` connections.

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* Merge recent changes from 4.1 into 5.0 RC branch.