Update dependencies for MS4U

[pranavmalaviya]

Updates the dependencies for the machine stats Unix package. I have a plan in motion to check it's validity against the following target subject instances:

Distribution	Python version	Notes
Ubuntu 18	Python 3.6	Controller instance
Ubuntu 16	Python 2.6	Subject instance
Ubuntu 16	Python 2.7	Subject instance
Ubuntu 16	Python 3.5	Subject instance
Ubuntu 18	Python 3.6	Subject instance
Ubuntu 18	Python 3.7	Subject instance
Ubuntu 18	Python 3.8	Subject instance
Ubuntu 18	Python 3.9	Subject instance
Ubuntu 18	Python 3.10	Subject instance
RHEL8	Python 2.6	Subject instance
RHEL8	Python 2.7	Subject instance
RHEL8	Python 3.6	Subject instance
RHEL8	Python 3.8	Subject instance
RHEL8	Python 3.9	Subject instance
RHEL8	Python 3.10	Subject instance

[pranavmalaviya]

Here are my results from running v2.5.7-alpha. I am releasing a production version based on these results.

Distribution	Python version	Notes	Outcome
Ubuntu 16	Python 2.6	Subject instance	✅
Ubuntu 16	Python 2.7	Subject instance	✅
Ubuntu 16	Python 3.5	Subject instance	✅
Ubuntu 18	Python 3.6	Subject instance	✅
Ubuntu 18	Python 3.7	Subject instance	✅
Ubuntu 18	Python 3.8	Subject instance	✅
Ubuntu 18	Python 3.9	Subject instance	✅
Ubuntu 18	Python 3.10	Subject instance	✅ (Assumed yes)
RHEL8	Python 2.6	Subject instance	❌ (same as before)
RHEL8	Python 2.7	Subject instance	✅
RHEL8	Python 3.5	Subject instance	✅ (Assumed yes)
RHEL8	Python 3.6	Subject instance	✅
RHEL8	Python 3.8	Subject instance	✅
RHEL8	Python 3.9	Subject instance	✅
RHEL8	Python 3.10	Subject instance	✅ (Assumed yes)

[pranavmalaviya]

More validation for the version 2.5.7 on the controller side.

Distribution	Python version	Notes	Outcome
Ubuntu 16	Python 2.6	Subject instance	❌ (same as before)
Ubuntu 16	Python 2.7	Subject instance	❌ (same as before)
Ubuntu 16	Python 3.5	Subject instance	❌
Ubuntu 18	Python 3.6	Subject instance	✅
Ubuntu 18	Python 3.6	Subject instance	✅
Ubuntu 18	Python 3.7	Subject instance	✅ (Assumed yes)
Ubuntu 18	Python 3.8	Subject instance	✅
Ubuntu 18	Python 3.9	Subject instance	✅ (Assumed yes)
Ubuntu 18	Python 3.10	Subject instance	✅
Ubuntu 18	Python 3.10	Subject instance	✅ (Assumed yes)
RHEL8	Python 2.6	Subject instance	❌ (same as before)
RHEL8	Python 2.7	Subject instance	❌ (same as before)
RHEL8	Python 3.5	Subject instance	❓ (Unknown)
RHEL8	Python 3.6	Subject instance	✅
RHEL8	Python 3.7	Subject instance	✅ (Assumed yes)
RHEL8	Python 3.8	Subject instance	✅ (Assumed yes)
RHEL8	Python 3.9	Subject instance	✅
RHEL8	Python 3.10	Subject instance	✅
RHEL8	Python 3.10	Subject instance	✅ (Assumed yes)