Set multiple salt process environment variables from a dict.
    Returns a dict.

    environ
        Must be a dict. The top-level keys of the dict are the names
        of the environment variables to set. Each key's value must be
        a string or False. Refer to the 'false_unsets' parameter for
        behavior when a value set to False.

    false_unsets
        If a key's value is False and false_unsets is True, then the
        key will be removed from the salt processes environment dict
        entirely. If a key's value is False and false_unsets is not
        True, then the key's value will be set to an empty string.
        Default: False

    clear_all
        USE WITH CAUTION! This option can unset environment variables
        needed for salt to function properly.
        If clear_all is True, then any environment variables not
        defined in the environ dict will be deleted.
        Default: False

    update_minion
        If True, apply these environ changes to the main salt-minion
        process. If False, the environ changes will only affect the
        current salt subprocess.
        Default: False

    permanent
        On Windows minions this will set the environment variable in the
        registry so that it is always added as an environment variable when
        applications open. If you want to set the variable to HKLM instead of
        HKCU just pass in "HKLM" for this parameter. On all other minion types
        this will be ignored. Note: This will only take affect on applications
        opened after this has been set.


    CLI Example:

    .. code-block:: bash

        salt '*' environ.setenv '{"foo": "bar", "baz": "quux"}'
        salt '*' environ.setenv '{"a": "b", "c": False}' false_unsets=True

def setenv(environ, false_unsets=False, clear_all=False, update_minion=False, permanent=False):
    '''
    Set multiple salt process environment variables from a dict.
    Returns a dict.

    environ
        Must be a dict. The top-level keys of the dict are the names
        of the environment variables to set. Each key's value must be
        a string or False. Refer to the 'false_unsets' parameter for
        behavior when a value set to False.

    false_unsets
        If a key's value is False and false_unsets is True, then the
        key will be removed from the salt processes environment dict
        entirely. If a key's value is False and false_unsets is not
        True, then the key's value will be set to an empty string.
        Default: False

    clear_all
        USE WITH CAUTION! This option can unset environment variables
        needed for salt to function properly.
        If clear_all is True, then any environment variables not
        defined in the environ dict will be deleted.
        Default: False

    update_minion
        If True, apply these environ changes to the main salt-minion
        process. If False, the environ changes will only affect the
        current salt subprocess.
        Default: False

    permanent
        On Windows minions this will set the environment variable in the
        registry so that it is always added as an environment variable when
        applications open. If you want to set the variable to HKLM instead of
        HKCU just pass in "HKLM" for this parameter. On all other minion types
        this will be ignored. Note: This will only take affect on applications
        opened after this has been set.


    CLI Example:

    .. code-block:: bash

        salt '*' environ.setenv '{"foo": "bar", "baz": "quux"}'
        salt '*' environ.setenv '{"a": "b", "c": False}' false_unsets=True
    '''
    ret = {}
    if not isinstance(environ, dict):
        log.debug(
            '%s: \'environ\' argument is not a dict: \'%s\'',
            __name__, environ
        )
        return False
    if clear_all is True:
        # Unset any keys not defined in 'environ' dict supplied by user
        to_unset = [key for key in os.environ if key not in environ]
        for key in to_unset:
            ret[key] = setval(key, False, false_unsets, permanent=permanent)
    for key, val in six.iteritems(environ):
        if isinstance(val, six.string_types):
            ret[key] = setval(key, val, permanent=permanent)
        elif val is False:
            ret[key] = setval(key, val, false_unsets, permanent=permanent)
        else:
            log.debug(
                '%s: \'val\' argument for key \'%s\' is not a string '
                'or False: \'%s\'', __name__, key, val
            )
            return False

    if update_minion is True:
        __salt__['event.fire']({'environ': environ,
                                'false_unsets': false_unsets,
                                'clear_all': clear_all,
                                'permanent': permanent
                                },
                               'environ_setenv')
    return ret