Fix Python3 comparison `TypeError` in `salt.modules.upstart` #46293

[Alex Dehnert]

When I try to use the Apache formula, I get:

          ID: apache
    Function: service.running
        Name: apache2
      Result: False
     Comment: An exception occurred in this state: Traceback (most recent call last):
                File "/usr/lib/python3/dist-packages/salt/state.py", line 1851, in call
                  **cdata['kwargs'])
                File "/usr/lib/python3/dist-packages/salt/loader.py", line 1795, in wrapper
                  return f(*args, **kwargs)
                File "/usr/lib/python3/dist-packages/salt/states/service.py", line 402, in running
                  if not _available(name, ret):
                File "/usr/lib/python3/dist-packages/salt/states/service.py", line 321, in _available
                  avail = __salt__['service.available'](name)
                File "/usr/lib/python3/dist-packages/salt/modules/upstart.py", line 317, in available
                  return name in get_all()
                File "/usr/lib/python3/dist-packages/salt/modules/upstart.py", line 345, in get_all
                  return sorted(get_enabled() + get_disabled())
                File "/usr/lib/python3/dist-packages/salt/modules/upstart.py", line 279, in get_enabled
                  if _sysv_is_enabled(name):
                File "/usr/lib/python3/dist-packages/salt/modules/upstart.py", line 229, in _sysv_is_enabled
                  return not _sysv_is_disabled(name)
                File "/usr/lib/python3/dist-packages/salt/modules/upstart.py", line 221, in _sysv_is_disabled
                  return not bool(glob.glob('/etc/rc{0}.d/S*{1}'.format(_runlevel(), name)))
                File "/usr/lib/python3/dist-packages/salt/modules/upstart.py", line 155, in _runlevel
                  utmp = _find_utmp()
                File "/usr/lib/python3/dist-packages/salt/modules/upstart.py", line 100, in _find_utmp
                  if result > 0:
              TypeError: '>' not supported between instances of 'dict' and 'int'
     Started: 08:08:36.996021
    Duration: 3.895 ms
     Changes:

Upstream salt seems to have fixed this already (https://github.com/saltstack/salt/pull/46293), but it seems like maybe this warrants being backported into the 18.04 package?

root@salt-4:/# lsb_release -rd
Description: Ubuntu 18.04.2 LTS
Release: 18.04
root@salt-4:/# apt-cache policy salt-common
salt-common:
  Installed: 2017.7.4+dfsg1-1
  Candidate: 2017.7.4+dfsg1-1
  Version table:
 *** 2017.7.4+dfsg1-1 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status
root@salt-4:/# dpkg -S /usr/lib/python3/dist-packages/salt/modules/upstart.py
salt-common: /usr/lib/python3/dist-packages/salt/modules/upstart.py