salt: salt.runner + state.orchestrate + parallel: True - is not parallel

Description of Issue

I’m trying to write an orchestration that could be executed in parallel when possible. And even I set parallel: True it executed serially.

Setup

I’m trying to do something like this: https://gist.github.com/Oloremo/f786f71044233e0db423d1d873e6c4ab

Steps to Reproduce Issue

I prepared a script to create salt orch structure: https://gist.github.com/Oloremo/90b600f60c48da051023a33da50ce5f7

cd to your salt file_root. and run the provided script. Directory delme will be created in it and populated with 6 files needed for parallel test. After you’re free to run something like salt-run state.orchestrate delme.service_orch -l debug 2>&1 | egrep 'Running state|Completed state'

Expected: serviceB and serviceC to be run in parallel. Reality: All services run serially one after another.

At first, I thought it’s because I’m running 2 states on a single minion. But feel free to modify targets from the example above so serviceB and serviceC will be run on different minions - and the results will be the same.

Versions Report

Salt Version:
           Salt: 2019.2.0

Dependency Versions:
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: Not Installed
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.10.1
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.6.2
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 3.6.8 (default, Aug  7 2019, 17:28:10)
   python-gnupg: 0.4.5
         PyYAML: 5.1.2
          PyZMQ: 18.0.2
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.5.3
            ZMQ: 4.3.1

System Versions:
           dist: centos 7.5.1804 Core
         locale: UTF-8
        machine: x86_64
        release: 3.10.0-862.3.2.el7.x86_64
         system: Linux
        version: CentOS Linux 7.5.1804 Core