salt: pip_state: An importable Python 2 pip module is required but could not be found on your system. This usually means that the system's pip package is not installed properly.

Description of Issue/Question

pip.installed fails to run:

----------
          ID: devpi_venv_pkgs
    Function: pip.installed
      Result: False
     Comment: An importable Python 2 pip module is required but could not be found on your system. This usually means that the system's pip package is not installed properly.
              An importable Python 2 pip module is required but could not be found on your system. This usually means that the system's pip package is not installed properly.
     Started: 16:46:18.340387
    Duration: 1.242 ms
     Changes:   

Setup

Relevant parts:

  devpi_pip_pkg:
    __env__: base
    __sls__: venvs.webapps.devpi
    pkg:
    - name: py35-pip
    - require:
      - pkg: devpi_python_pkg
    - installed
    - order: 10007

  devpi_python_pkg:
    __env__: base
    __sls__: venvs.webapps.devpi
    pkg:
    - name: python35
    - installed
    - order: 10005

  devpi_venv:
    __env__: base
    __sls__: venvs.webapps.devpi
    virtualenv:
    - name: /usr/local/venvs/devpi
    - venv_bin: /usr/local/bin/pyvenv-3.5
    - system_site_packages: false
    - user: www-devpi
    - clear: false
    - pip_upgrade: true
    - pip_pkgs:
      - pip
      - setuptools
      - certifi
    - require:
      - file: /usr/local/venvs/devpi
      - user: www-devpi
      - pkg: devpi_python_pkg
      - pkg: postgresql93-client
    - managed
    - order: 10006

  devpi_venv_pkgs:
    __env__: base
    __sls__: venvs.webapps.devpi
    pip:
    - pkgs:
      - devpi-server
      - devpi-web
    - user: www-devpi
    - cwd: /usr/local/venvs/devpi
    - bin_env: /usr/local/venvs/devpi/bin/pip
    - reload_modules: true
    - require:
      - virtualenv: devpi_venv
      - pkg: devpi_pip_pkg
    - installed
    - order: 10008

This is my complete sls:

{% if cfg.lang == 'python' %}

##########
# PYTHON #
##########

# Python packages
{{ venv }}_python_pkg:
  pkg.installed:
    - name: python{{ cfg.python_version|string|replace('.', '') }}

# Python virtualenv (only needed for Python 2)
{% if cfg.python_version == 2.7 %}
{{ venv }}_virtualenv_pkg:
  pkg.installed:
    - name: py27-virtualenv
{% endif %}

# Install the virtualenv
{{ venv }}_venv:
  virtualenv.managed:
    - name: {{ cfg.full_path }}
    - venv_bin: {{ cfg.venv_builder }}
    - system_site_packages: False
    - user: {{ cfg.user }}
    - clear: False
    - pip_upgrade: True
    - pip_pkgs:
      - pip
      - setuptools
      - certifi
    - require:
      - file: {{ cfg.full_path }}
      - user: {{ cfg.user }}
      - pkg: {{ venv }}_python_pkg
      - pkg: {{ salt['pillar.get']('postgresql:lookup:pkg_client') }}

{% if cfg.pip_pkgs is defined %}
{{ venv }}_pip_pkg:
  pkg.installed:
    - name: py{{ cfg.python_version|string|replace('.', '') }}-pip
    - require:
      - pkg: {{ venv }}_python_pkg

{{ venv }}_venv_pkgs:
  pip.installed:
    - pkgs:
        {{ cfg.pip_pkgs|yaml }}
    - user: {{ cfg.user }}
    - cwd: {{ cfg.full_path }}
    - bin_env: {{ cfg.pip }}
    - reload_modules: True
    - require:
      - virtualenv: {{ venv }}_venv
      - pkg: {{ venv }}_pip_pkg
{% endif %}

# Upgrade pip,setuptools,certifi to latest version (once the virtualenv is installed)
#{{ venv }}_upgrade_pip:
#  cmd.run:
#    - name: {{ cfg.pip }} --no-cache-dir install -U pip setuptools certifi
#    - runas: {{ cfg.user }}
#    - reload_modules: True
#    - require:
#      - virtualenv: {{ venv }}_venv

Steps to Reproduce Issue

Any pip.installed with Python 3 (haven’t tested with Python 2) should fail, even when the pip package is installed globally (which should not be needed anyway).

This is because of https://github.com/saltstack/salt/blob/develop/salt/states/pip_state.py#L112-L119

Versions Report

salt% salt --versions-report
Salt Version:
           Salt: 2017.7.2
 
Dependency Versions:
           cffi: 1.11.2
       cherrypy: Not Installed
       dateutil: 2.6.1
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: 1.5.0
         Jinja2: 2.10
        libgit2: Not Installed
        libnacl: 1.5.2
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.7
   mysql-python: Not Installed
      pycparser: 2.10
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.14 (default, Jan  8 2018, 23:05:24)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 16.0.3
           RAET: 0.6.5
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.5.2
            ZMQ: 4.2.2
 
System Versions:
           dist:   
         locale: UTF-8
        machine: amd64
        release: 10.3-RELEASE
         system: FreeBSD
        version: Not Installed