Failed to load ext_pillar stack: no filter named 'list_files'

[Kassec]

Hello,

Trying to use some jinja filters leads to this kind of error:
Failed to load ext_pillar stack: no filter named 'list_files'

Salt Version:
           Salt: 2017.7.5
 
Dependency Versions:
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: 2.5.3
      docker-py: Not Installed
          gitdb: 2.0.0
      gitpython: 2.1.1
          ioflo: Not Installed
         Jinja2: 2.9.4
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.4.8
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.13 (default, Nov 24 2017, 17:33:09)
   python-gnupg: Not Installed
         PyYAML: 3.12
          PyZMQ: 16.0.2
           RAET: Not Installed
          smmap: 2.0.1
        timelib: Not Installed
        Tornado: 4.4.3
            ZMQ: 4.2.1
 
System Versions:
           dist: debian 9.4 
         locale: UTF-8
        machine: x86_64
        release: 4.9.0-6-amd64
         system: Linux
        version: debian 9.4 

[Kassec]

Following this I found I couldn't access goodies under "salt.utils" even by other means.

The following jinja in a file parsed by stack:

data1:
  {{ __salt__['pillar.get']('foo:bar:baz', 'qux') }}
data2:
  {{ __salt__['log.error']('works ?') }}
data3:
  {{ __salt__['dnsutil.AAAA']('google.com') }}

Ends up in pillar the way it should:

# salt '*' pillar.items
salt-master:
    ----------
    data1:
        qux
    data2:
        True
    data3:
        - 2a00:1450:4007:810::200e

Trying to access salt.utils namespace with:

data4:
  {{ __salt__['utils.hashutils.md5_digest']('data') }}

Generates an error:

# salt '*' pillar.items
salt-master:
    ----------
    _errors:
        - Failed to load ext_pillar stack: 'salt.loader.LazyLoader object' has no attribute 'utils.hashutils.md5_digest'