feat(agent_install): only install required packages [SMAGENT-6558] (#465

)

rework the role so to only install the packages required by the
selected driver (and therefore, the respective dependencies).
Also, remove packages which are no longer required by the
selected driver type.

Notice we need to craft a list augmented with the selected
version, if one is present.

Most of the selection logic (namely, based on the version)
resides in the 'agent' filter which is probably far from
ideal but gets the job done.

Side changes to make CI pass on this PR:
* DO NOT delete environment file in case of kmod (otherwise agent 13.1.0 will fail)
* DO NOT RUN tests on Ubuntu 18.04 (due older systemd not accepting non-absolute path for kill --  otherwise agent 13.1.0 will fail)
* execute local forwarder test on EC2 instead of container (due to systemd unit)

molecule/agent-local-forwarder/converge.yml.template

@@ -2,6 +2,7 @@
 - name: Converge
   hosts: all
   strategy: free
+  become: true
   roles:
     - role: sysdig.agent.agent_install
   vars:

molecule/agent-local-forwarder/molecule.yml → molecule/agent-local-forwarder/molecule.yml.template

@@ -2,14 +2,19 @@
 dependency:
   name: galaxy
 driver:
-  name: docker
+  name: ec2
 platforms:
-  - name: centos-stream8
-    image: quay.io/centos/centos:stream8
-    pre_build_image: true
-    privileged: true
+  - name: amazon-2023-x86_64
+    image: ami-05f216df7591e93b1
+    instance_type: ${INSTANCE_TYPE_X86}
+    region: ${REGION}
+    vpc_subnet_id: ${VPC_SUBNET_ID}
 provisioner:
   name: ansible
+  playbooks:
+    create: ../resources/playbooks/create.yml
+    destroy: ../resources/playbooks/destroy.yml
+    prepare: ../resources/playbooks/prepare.yml
 scenario:
   create_sequence:
     - create

molecule/agent-local-forwarder/tests/test_local_forwarder.py

@@ -1,3 +1,4 @@
 def test_forwarder_emitter(host):
-    f = host.file("/opt/draios/logs/draios.log")
-    assert f.contains("local forwarder enabled: true")
+    with host.sudo():
+        f = host.file("/opt/draios/logs/draios.log")
+        assert f.contains("local forwarder enabled: true")