Allow for configurable extra vm dump checks for present/absent messages

The typical use for this is when dumping extra logs and wanting to
make sure certain information is always present (e.g. startup, etc.)
and certain information is always absent (e.g. segfaults, etc.).

Signed-off-by: Plamen Dimitrov <plamen.dimitrov@intra2net.com>

Author: pevogam

virttest/env_process.py

@@ -679,7 +679,7 @@ def postprocess_vm(test, params, env, name):
         vm_extra_dumps = os.path.join(test.outputdir, "vm_extra_dumps")
         if not os.path.exists(vm_extra_dumps):
             os.makedirs(vm_extra_dumps)
-        for dump_path in params.get("vm_extra_dump_paths").split(";"):
+        for i, dump_path in enumerate(params.get_list("vm_extra_dump_paths", delimiter=";")):
             try:
                 vm.copy_files_from(dump_path, vm_extra_dumps)
             except:
@@ -688,6 +688,17 @@ def postprocess_vm(test, params, env, name):
                     dump_path,
                     vm.name,
                 )
+            if params.get_boolean(f"verify_vm_extra_dump_{i}"):
+                for message in params.get_list(f"expected_vm_extra_dump_{i}", delimiter=";"):
+                    if not vm.session.cmd(f"grep {message} {dump_path}"):
+                        raise exceptions.TestFail(
+                            "Missing expected message {message} in {vm.name} extra dump {dump_path}"
+                        )
+                for message in params.get_list(f"unexpected_vm_extra_dump_{i}", delimiter=";"):
+                    if not vm.session.cmd(f"grep {message} -v {dump_path}"):
+                        raise exceptions.TestFail(
+                            "Redundant unexpected message {message} in {vm.name} extra dump {dump_path}"
+                        )
 
     if params.get("kill_vm") == "yes":
         kill_vm_timeout = float(params.get("kill_vm_timeout", 0))