Fix PyLint errors discovered when upgrading to newer version

* Fixes PyLint to run in the virtualenv used for all tests

* Replaced 'LooseVersion' with 'parse_version' from setuptools
- This is a work around for the issue in
  https://github.com/PyCQA/pylint/issues/73 in which pylint can not
  import disutils.version correctly in a virtualenv.

* Removed the unused function 'delete_hosts' which was causing a
  pylint error as well

* Removed a deprecated pylint pragma option, 'bad-builtin'

* Fixed some import ordering issues it was picky about

* Added another disable for a case where the PyLint suggestion would
  have us altering the container we would be iterating over

* Add code-coverage reports to the unittests with the MINIMUM coverage
  percentage for success set to 70%
- Current test coverage is at 76%

3 files changed, 16 insertions, 28 deletions

diff --git a/utils/src/ooinstall/cli_installer.py b/utils/src/ooinstall/cli_installer.py
index 67f3659ff..9420ec287 100644
--- a/utils/src/ooinstall/cli_installer.py
+++ b/utils/src/ooinstall/cli_installer.py
@@ -5,7 +5,8 @@
 import os
 import re
 import sys
-from distutils.version import LooseVersion
+import logging
+import setuptools.version
 import click
 from ooinstall import openshift_ansible
 from ooinstall.oo_config import OOConfig
@@ -13,7 +14,6 @@ from ooinstall.oo_config import OOConfigInvalidHostError
 from ooinstall.oo_config import Host, Role
 from ooinstall.variants import find_variant, get_variant_version_combos
 
-import logging
 installer_log = logging.getLogger('installer')
 installer_log.setLevel(logging.CRITICAL)
 installer_file_handler = logging.FileHandler('/tmp/installer.txt')
@@ -98,27 +98,6 @@ def list_hosts(hosts):
         click.echo('   {}: {}'.format(idx, hosts[idx]))
 
 
-def delete_hosts(hosts):
-    while True:
-        list_hosts(hosts)
-        del_idx = click.prompt('Select host to delete, y/Y to confirm, '
-                               'or n/N to add more hosts', default='n')
-        try:
-            del_idx = int(del_idx)
-            hosts.remove(hosts[del_idx])
-        except IndexError:
-            click.echo("\"{}\" doesn't match any hosts listed.".format(del_idx))
-        except ValueError:
-            try:
-                response = del_idx.lower()
-                if response in ['y', 'n']:
-                    return hosts, response
-                click.echo("\"{}\" doesn't correspond to any valid input.".format(del_idx))
-            except AttributeError:
-                click.echo("\"{}\" doesn't correspond to any valid input.".format(del_idx))
-    return hosts, None
-
-
 def collect_hosts(oo_cfg, existing_env=False, masters_set=False, print_summary=True):
     """
         Collect host information from user. This will later be filled in using
@@ -652,8 +631,11 @@ https://docs.openshift.com/enterprise/latest/admin_guide/install/prerequisites.h
         oo_cfg.deployment.variables['master_routingconfig_subdomain'] = get_master_routingconfig_subdomain()
         click.clear()
 
+    current_version = setuptools.version.pkg_resources.parse_version(
+        oo_cfg.settings.get('variant_version', '0.0'))
+    min_version = setuptools.version.pkg_resources.parse_version('3.2')
     if not oo_cfg.settings.get('openshift_http_proxy', None) and \
-       LooseVersion(oo_cfg.settings.get('variant_version', '0.0')) >= LooseVersion('3.2'):
+       current_version >= min_version:
         http_proxy, https_proxy, proxy_excludes = get_proxy_hostnames_and_excludes()
         oo_cfg.deployment.variables['proxy_http'] = http_proxy
         oo_cfg.deployment.variables['proxy_https'] = https_proxy
@@ -920,7 +902,7 @@ def uninstall(ctx):
 @click.option('--latest-minor', '-l', is_flag=True, default=False)
 @click.option('--next-major', '-n', is_flag=True, default=False)
 @click.pass_context
-# pylint: disable=bad-builtin,too-many-statements
+# pylint: disable=too-many-statements
 def upgrade(ctx, latest_minor, next_major):
     oo_cfg = ctx.obj['oo_cfg']
 
diff --git a/utils/src/ooinstall/oo_config.py b/utils/src/ooinstall/oo_config.py
index b9f0cc65c..409276360 100644
--- a/utils/src/ooinstall/oo_config.py
+++ b/utils/src/ooinstall/oo_config.py
@@ -2,10 +2,11 @@
 
 import os
 import sys
+import logging
 import yaml
 from pkg_resources import resource_filename
 
-import logging
+
 installer_log = logging.getLogger('installer')
 
 CONFIG_PERSIST_SETTINGS = [
@@ -325,6 +326,10 @@ class OOConfig(object):
         self.settings['ansible_inventory_path'] = \
             '{}/hosts'.format(os.path.dirname(self.config_path))
 
+        # pylint: disable=consider-iterating-dictionary
+        # Disabled because we shouldn't alter the container we're
+        # iterating over
+        #
         # clean up any empty sets
         for setting in self.settings.keys():
             if not self.settings[setting]:
diff --git a/utils/src/ooinstall/openshift_ansible.py b/utils/src/ooinstall/openshift_ansible.py
index 001c58d73..4113bb126 100644
--- a/utils/src/ooinstall/openshift_ansible.py
+++ b/utils/src/ooinstall/openshift_ansible.py
@@ -4,9 +4,10 @@ import socket
 import subprocess
 import sys
 import os
+import logging
 import yaml
 from ooinstall.variants import find_variant
-import logging
+
 installer_log = logging.getLogger('installer')
 
 CFG = None
@@ -229,7 +230,7 @@ def load_system_facts(inventory_file, os_facts_path, env_vars, verbose=False):
         os_facts_path])
     installer_log.debug("Going to subprocess out to ansible now with these args: %s", ' '.join(args))
     status = subprocess.call(args, env=env_vars, stdout=FNULL)
-    if not status == 0:
+    if status != 0:
         installer_log.debug("Exit status from subprocess was not 0")
         return [], 1