test(userspace/engine): add integration test for rules enabled with enabled flag only

Signed-off-by: Jason Dellaluce <jasondellaluce@gmail.com>

test/rules/enabled_rule_using_enabled_flag_only.yaml

@@ -0,0 +1,25 @@
+#
+# Copyright (C) 2021 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+- rule: open_from_cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen"
+  priority: WARNING
+  enabled: false
+
+- rule: open_from_cat
+  enabled: true