salt: Minion returns "No response" for most commands in 2019.2.2 with "RNG" related error

Description of Issue

After upgrading from 2019.2.0 to 2019.2.2 some salt commands fail with [No response]. pillar.items works, but:

• state.apply
• test.ping
• cmd.run
• grains.items

Do not work. I only tested these 5 commands. state.apply test=True does work though, as does running salt-call state.apply from the minion.

I also made a typo when testing this and grais.items also gets no response instead of an error about how the command does not exist.

Steps to Reproduce Issue

Run any of the commands from the master noted in the Issue Description to reproduce the issue.

Minion logs show errors:

2019-10-24 13:23:55,967 [salt.utils.process                                    :754 ][ERROR   ][12525] An un-handled exception from the multiprocessing process 'SignalHandlingMultiprocessingProcess-1:25' was caught:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/salt/utils/process.py", line 747, in run
    return super(MultiprocessingProcess, self).run()
	...
  File "/usr/lib64/python2.7/site-packages/Crypto/Random/_UserFriendlyRNG.py", line 153, in _check_pid
    raise AssertionError("PID check failed. RNG must be re-initialized after fork(). Hint: Try Random.atfork()")
AssertionError: PID check failed. RNG must be re-initialized after fork(). Hint: Try Random.atfork()
2019-10-24 13:24:01,072 [salt.utils.process                                    :754 ][ERROR   ][12526] An un-handled exception from the multiprocessing process 'SignalHandlingMultiprocessingProcess-1:26' was caught:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/salt/utils/process.py", line 747, in run
    return super(MultiprocessingProcess, self).run()
	...
  File "/usr/lib64/python2.7/site-packages/Crypto/Random/_UserFriendlyRNG.py", line 153, in _check_pid
    raise AssertionError("PID check failed. RNG must be re-initialized after fork(). Hint: Try Random.atfork()")
AssertionError: PID check failed. RNG must be re-initialized after fork(). Hint: Try Random.atfork()

Versions Report

Salt Version:
           Salt: 2019.2.2
 
Dependency Versions:
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: Not Installed
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.8.1
        libgit2: 0.20.0
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.6
   mysql-python: 1.2.5
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: 0.20.3
         Python: 2.7.14 (default, Jan 31 2018, 02:12:13)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 14.5.0
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.0.5
 
System Versions:
           dist: redhat 6.10 Santiago
         locale: UTF-8
        machine: x86_64
        release: 2.6.32-754.18.2.el6.x86_64
         system: Linux
        version: Red Hat Enterprise Linux Server 6.10 Santiago