"'drac' __virtual__ returned False" from salt-run drac.version host

[tjyang]

Description of Issue/Question

Please add detail reason why the command failed
Ref: #31900

Setup

/etc/salt/master
drac:
  username: account
  password: mypass

Steps to Reproduce Issue

/usr/bin/salt-run   drac.version idrac01.test.com

Versions Report

Salt Version:
           Salt: 2016.3.2

Dependency Versions:
           cffi: 0.8.6
       cherrypy: 3.2.2
       dateutil: 1.5
          gitdb: 0.6.4
      gitpython: 1.0.1
          ioflo: Not Installed
         Jinja2: 2.7.2
        libgit2: 0.21.0
        libnacl: Not Installed
       M2Crypto: 0.21.1
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.7
   mysql-python: Not Installed
      pycparser: 2.14
       pycrypto: 2.6.1
         pygit2: 0.21.4
         Python: 2.7.5 (default, Aug 18 2016, 15:58:25)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 15.3.0
           RAET: Not Installed
          smmap: 0.9.0
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: centos 7.2.1511 Core
        machine: x86_64
        release: 3.10.0-327.28.2.el7.x86_64
         system: Linux
        version: CentOS Linux 7.2.1511 Core

[Ch3LL]

@tjyang agreed we need to add reasoning behind why this is failing. Thanks

[rallytime]

First we need to expand the handy "why didn't this module load" error reporting to runners like we do for states and modules. After that, these should be easy to clean up.

[rallytime]

Oh, we actually do already handle that for runners. I was mistaken when I tested it at first. I've added a more helpful error message and cleaned up some potential stacktraces/KeyErrors in #35868.