Comment # 3 on bug 954596 from Owen Synge

As I understand it the zip file should live in /srv/salt/_modules/ as I am have
done. This bug should be refocused on zip delivery.

Tim's suggestion seems against the documentation, 

    https://docs.saltstack.com/en/latest/ref/modules/

but works, so the documentation should also be updated.

I expended the module in _modules and with some fiddling got it to run.

salt:/srv/salt # salt '*'  saltutil.sync_modules
linux-2grp.fritz.box:
    - modules.sesceph.__init__
linux-geds.fritz.box:
    - modules.sesceph.__init__
salt-deb.yokel.org:
    - modules.sesceph.__init__
    - modules.sesceph.__init__
salt:/srv/salt # cat _modules/sesceph/__init__.py
import logging

log = logging.getLogger(__name__)

__virtualname__ = 'sesceph'


def is_ok():
    '''
    A function to make some spam with eggs!

    CLI Example::

        salt '*' test.spam eggs
    '''
    log.error('wibble')
    return {"one" : "two" }


def __virtual__():
    return __virtualname__
salt:/srv/salt # salt '*' sesceph.is_ok
[ERROR   ] Invalid outputter is_ok specified, fall back to nested
salt-deb.yokel.org:
    ----------
    one:
        two
linux-2grp.fritz.box:
    ----------
    one:
        two
linux-geds.fritz.box:
    ----------
    one:
        two