salt-ssh error on 2015.8

[jfindlay]

@basepi, @cachedout

commands

If I switch to 2015.8.0rc3, the following command works.

[root@localhost ~]# salt-ssh jmoney-centos-7-2 -i test.ping
jmoney-centos-7-2:
    ----------
    retcode:
        1
    stderr:
        [CRITICAL] Unable to import msgpack or msgpack_pure python modules
        [ERROR   ] An un-handled exception was caught by salt's global exception handler:
        NameError: name 'msgpack' is not defined
        Traceback (most recent call last):
          File "/tmp/.root_c87ee6_salt/salt-call", line 4, in <module>
            salt_call()
          File "/tmp/.root_c87ee6_salt/salt/scripts.py", line 325, in salt_call
            import salt.cli.call
          File "/tmp/.root_c87ee6_salt/salt/cli/call.py", line 6, in <module>
            from salt.utils import parsers
          File "/tmp/.root_c87ee6_salt/salt/utils/parsers.py", line 26, in <module>
            import salt.config as config
          File "/tmp/.root_c87ee6_salt/salt/config.py", line 39, in <module>
            import salt.utils.sdb
          File "/tmp/.root_c87ee6_salt/salt/utils/sdb.py", line 9, in <module>
            import salt.loader
          File "/tmp/.root_c87ee6_salt/salt/loader.py", line 28, in <module>
            import salt.utils.event
          File "/tmp/.root_c87ee6_salt/salt/utils/event.py", line 80, in <module>
            import salt.payload
          File "/tmp/.root_c87ee6_salt/salt/payload.py", line 52, in <module>
            if not hasattr(msgpack, 'exceptions'):
        NameError: name 'msgpack' is not defined
        Traceback (most recent call last):
          File "/tmp/.root_c87ee6_salt/salt-call", line 4, in <module>
            salt_call()
          File "/tmp/.root_c87ee6_salt/salt/scripts.py", line 325, in salt_call
            import salt.cli.call
          File "/tmp/.root_c87ee6_salt/salt/cli/call.py", line 6, in <module>
            from salt.utils import parsers
          File "/tmp/.root_c87ee6_salt/salt/utils/parsers.py", line 26, in <module>
            import salt.config as config
          File "/tmp/.root_c87ee6_salt/salt/config.py", line 39, in <module>
            import salt.utils.sdb
          File "/tmp/.root_c87ee6_salt/salt/utils/sdb.py", line 9, in <module>
            import salt.loader
          File "/tmp/.root_c87ee6_salt/salt/loader.py", line 28, in <module>
            import salt.utils.event
          File "/tmp/.root_c87ee6_salt/salt/utils/event.py", line 80, in <module>
            import salt.payload
          File "/tmp/.root_c87ee6_salt/salt/payload.py", line 52, in <module>
            if not hasattr(msgpack, 'exceptions'):
        NameError: name 'msgpack' is not defined
    stdout:

versions

[root@localhost ~]# salt-ssh --versions
Salt Version:
           Salt: 2015.8.0rc3-1123-gf68ba28

Dependency Versions:
         Jinja2: 2.7.2
       M2Crypto: 0.21.1
           Mako: Not Installed
         PyYAML: 3.10
          PyZMQ: 14.3.1
         Python: 2.7.5 (default, Jun 17 2014, 18:11:42)
           RAET: Not Installed
        Tornado: 4.1
            ZMQ: 3.2.5
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
        libnacl: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.6
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
         pygit2: Not Installed
   python-gnupg: Not Installed
          smmap: Not Installed
        timelib: Not Installed

System Versions:
           dist: centos 7.0.1406 Core
        machine: x86_64
        release: 4.1.5-x86_64-linode61
         system: CentOS Linux 7.0.1406 Core