Remove usages of SSL related config options in utils

SSL support was removed by [1] which resulted in removal of some
SSL related config options, but two config options 'key_file' and
'cert_file' are still used in utils.stash_conf_values() which is called
in reload functionality. When SIGHUP is sent to the parent process,
this usage causes it to crash and its children processes become orphaned,
which then causes the reload test to be stale (fail).

This change also includes:
- Remove 2 attributes and the decorator that help to skip this test
  (self.diable, self.disabled_message, and @skip_if_disabled)

[1] https://review.opendev.org/#/c/697969/5/glance/common/wsgi.py

Change-Id: I361c9d0b53a67b1cc60f0f3012e22accdcc46055
Closes-Bug: #1855708

glance/common/utils.py

@@ -557,10 +557,7 @@ def stash_conf_values():
     conf = {
         'bind_host': CONF.bind_host,
         'bind_port': CONF.bind_port,
-        'tcp_keepidle': CONF.cert_file,
         'backlog': CONF.backlog,
-        'key_file': CONF.key_file,
-        'cert_file': CONF.cert_file
     }
 
     return conf

glance/tests/functional/test_reload.py

@@ -23,7 +23,6 @@ from six.moves import http_client as http
 
 from glance.tests import functional
 from glance.tests.utils import execute
-from glance.tests.utils import skip_if_disabled
 
 TEST_VAR_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__),
                                             '../', 'var'))
@@ -49,8 +48,6 @@ class TestReload(functional.FunctionalTest):
         self.cleanup()
         self.workers = 1
         self.include_scrubber = False
-        self.disabled = True
-        self.disabled_message = "Reload is broken, Bug 1855708"
 
     def tearDown(self):
         if not self.disabled:
@@ -105,7 +102,6 @@ class TestReload(functional.FunctionalTest):
     def _url(self, protocol, path):
         return '%s://127.0.0.1:%d%s' % (protocol, self.api_port, path)
 
-    @skip_if_disabled
     def test_reload(self):
         """Test SIGHUP picks up new config values"""
         def check_pids(pre, post=None, workers=2):