salt: "Failed to load function" errors on 2018.3.3 master

Description of Issue/Question

I’m in the process of upgrading to 2018.3.3, and see these errors in the master log:

2018-12-06 18:31:33,825 [salt.loader      :1698][ERROR   ][21774] Failed to load function {'cmd': '_file_envs'}.envs because its module ({'cmd': '_file_envs'}) is not in the whitelist: [u'gitfs', u'roots']
2018-12-06 18:31:33,825 [salt.loader      :1698][ERROR   ][21774] Failed to load function {'cmd': '_file_envs.envs because its module ({'cmd': '_file_envs) is not in the whitelist: [u'gitfs', u'roots']

I am unsure if this is causing any actual problems, because everything seems to work.

Steps to Reproduce Issue

Any state.sls call will trigger the errors, even with a very simple SLS, such as:

Simple test:
  test.nop

Versions Report

Salt Version: Salt: 2018.3.3

Dependency Versions: cffi: Not Installed cherrypy: Not Installed dateutil: Not Installed docker-py: Not Installed gitdb: 2.0.5 gitpython: 2.1.11 ioflo: Not Installed Jinja2: 2.10 libgit2: Not Installed libnacl: Not Installed M2Crypto: Not Installed Mako: Not Installed msgpack-pure: Not Installed msgpack-python: 0.6.0 mysql-python: Not Installed pycparser: Not Installed pycrypto: 2.6.1 pycryptodome: Not Installed pygit2: Not Installed Python: 2.7.15 (default, Dec 6 2018, 16:19:54) python-gnupg: Not Installed PyYAML: 3.13 PyZMQ: 17.1.2 RAET: Not Installed smmap: 2.0.5 timelib: Not Installed Tornado: 5.1.1 ZMQ: 4.2.5

System Versions: dist: redhat 7.5 Maipo locale: UTF-8 machine: x86_64 release: 4.1.12-124.15.2.el7uek.x86_64 system: Linux version: Red Hat Enterprise Linux Server 7.5 Maipo