[CRITICAL] Unable to import msgpack or msgpack_pure python modules
        [ERROR   ] An un-handled exception was caught by salt's global exception handler:
        ImportError: No module named msgpack
        Traceback (most recent call last):
          File "/tmp/.root_85e717_salt/salt-call", line 13, in <module>
            from salt.scripts import salt_call
          File "/tmp/.root_85e717_salt/py2/salt/scripts.py", line 17, in <module>
            from salt import cloud, defaults
          File "/tmp/.root_85e717_salt/py2/salt/cloud/__init__.py", line 29, in <module>
            import salt.config
          File "/tmp/.root_85e717_salt/py2/salt/config/__init__.py", line 41, in <module>
            import salt.utils.sdb
          File "/tmp/.root_85e717_salt/py2/salt/utils/sdb.py", line 9, in <module>
            import salt.loader
          File "/tmp/.root_85e717_salt/py2/salt/loader.py", line 29, in <module>
            import salt.utils.event
          File "/tmp/.root_85e717_salt/py2/salt/utils/event.py", line 82, in <module>
            import salt.transport.ipc
          File "/tmp/.root_85e717_salt/py2/salt/transport/ipc.py", line 10, in <module>
            import msgpack
        ImportError: No module named msgpack
        Traceback (most recent call last):
          File "/tmp/.root_85e717_salt/salt-call", line 13, in <module>
            from salt.scripts import salt_call
          File "/tmp/.root_85e717_salt/py2/salt/scripts.py", line 17, in <module>
            from salt import cloud, defaults
          File "/tmp/.root_85e717_salt/py2/salt/cloud/__init__.py", line 29, in <module>
            import salt.config
          File "/tmp/.root_85e717_salt/py2/salt/config/__init__.py", line 41, in <module>
            import salt.utils.sdb
          File "/tmp/.root_85e717_salt/py2/salt/utils/sdb.py", line 9, in <module>
            import salt.loader
          File "/tmp/.root_85e717_salt/py2/salt/loader.py", line 29, in <module>
            import salt.utils.event
          File "/tmp/.root_85e717_salt/py2/salt/utils/event.py", line 82, in <module>
            import salt.transport.ipc
          File "/tmp/.root_85e717_salt/py2/salt/transport/ipc.py", line 10, in <module>
            import msgpack
        ImportError: No module named msgpack