Fix tox.ini to run unit tests on CI

Change-Id: I64a998b04e432397dcb34f70e7a0167374147eef
diff --git a/tcp_tests/tests/system/test_install_k8s.py b/tcp_tests/tests/system/test_install_k8s.py
index 2294cf6..018f561 100644
--- a/tcp_tests/tests/system/test_install_k8s.py
+++ b/tcp_tests/tests/system/test_install_k8s.py
@@ -89,7 +89,7 @@
             current_targets = prometheus_client.get_targets()
             LOG.debug('Current targets after install {0}'
                       .format(current_targets))
-        except:
+        except Exception:
             LOG.warning('Restarting keepalived service on mon nodes...')
             sl_actions._salt.local(tgt='mon*', fun='cmd.run',
                                    args='systemctl restart keepalived')
@@ -151,7 +151,7 @@
             current_targets = prometheus_client.get_targets()
             LOG.debug('Current targets after install {0}'
                       .format(current_targets))
-        except:
+        except Exception:
             LOG.warning('Restarting keepalived service on mon nodes...')
             sl_actions._salt.local(tgt='mon*', fun='cmd.run',
                                    args='systemctl restart keepalived')