salt: [2017.7.7] salt-master with gitfs fails to start on centos7.5 with latest pygit2

Description of Issue/Question

salt-master with gitfs fails to start on centos7.5 with latest pygit2

Setup

CentOS 7.5 Salt-Master 2017.7.7 python-pygit2.x86_64 0:0.26.4-1.el7

Steps to Reproduce Issue

$ cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)
$ rpm -qa | grep git2
libgit2-0.26.6-1.el7.x86_64
python-pygit2-0.26.4-1.el7.x86_64
$ cat /var/log/salt/master
2018-09-10 11:41:39,111 [salt.utils.gitfs :359 ][CRITICAL][27230] Exception caught while initializing gitfs remote 'git@mygitlab.example.com:user/repo.git': global name 'git' is not defined
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/salt/utils/gitfs.py", line 353, in __init__
    self.new = self.init_remote()
  File "/usr/lib/python2.7/site-packages/salt/utils/gitfs.py", line 1474, in init_remote
    self.configure_refspecs()
  File "/usr/lib/python2.7/site-packages/salt/utils/gitfs.py", line 529, in configure_refspecs
    except (git.exc.GitCommandError, GitRemoteError) as exc:
NameError: global name 'git' is not defined
2018-09-10 11:41:39,112 [salt.master      :496 ][CRITICAL][27230] Failed to load gitfs
2018-09-10 11:41:39,112 [salt.master      :497 ][CRITICAL][27230] Master failed pre flight checks, exiting

Versions Report

Salt Version:
           Salt: 2017.7.7

Dependency Versions:
           cffi: 1.6.0
       cherrypy: Not Installed
       dateutil: 1.5
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.7.2
        libgit2: 0.26.3
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.5.1
   mysql-python: Not Installed
      pycparser: 2.14
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: 0.26.4
         Python: 2.7.5 (default, Aug  4 2017, 00:39:18)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 15.3.0
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: centos 7.5.1804 Core
         locale: UTF-8
        machine: x86_64
        release: 3.10.0-693.5.2.el7.x86_64
         system: Linux
        version: CentOS Linux 7.5.1804 Core