ENT-14194 2. Reset classes and variables between "then" bundle runs in cf-reactor

[victormlg]

Classes that are defined inside a then bundle can stay defined between runs, even though the condition is not true anymore:

Exemple:

body when file_deleted(filename)
{
  file_deleted => "$(filename)";
}

bundle agent check_marker(file)
{
  classes:
    "marker_exists" expression => fileexists("/tmp/marker"), scope => "namespace";

  files:
    "$(file)" create => "true";

  reports:
    marker_exists::
      "marker exists";
    !marker_exists::
      "marker does not exist";
}

bundle reactor event_handler
{
  vars:
    "Z" string => "/tmp/a";

  events:
    "Watch /tmp/a"
      when => file_deleted("$(Z)"),
      then => check_marker("$(Z)");
}

• 1st event: /tmp/marker exists, marker_exists is defined
• delete /tmp/marker
• 2nd event: /tmp/marker doesn't exists, marker_exists is still defined

Persistent classes should not be deleted